CLUB SNAPSHOT: At a Glance
| Category | Details |
|---|---|
| Club | 1. FC Union Berlin |
| League | Bundesliga |
| Manager | Mauro Lustrinelli |
| Stadium | Stadion An der Alten Försterei |
| Nickname | Die Eisernen |
| Founded | 1966 |
| First-Choice Goalkeeper | Frederik Rønnow |
| Backup | Matheo Raab |
| Third Choice | Carl Klaus |
| Key Departure | Alexander Schwolow (contract expired) |
| Defining Trait | A veteran number one behind a defence that offers him little protection, with a backup whose only appearance this season ended in three goals conceded |
The Defining Moment
Union Berlin’s goalkeeping situation entered the 2026/27 season with a stability that was, in truth, more apparent than real. Frederik Rønnow, the 34-year-old Danish international, remained the undisputed number one, as he had been for five seasons. Matheo Raab, the 27-year-old signed from Hamburger SV in July 2025, was the backup. Carl Klaus, at 32, offered emergency cover . The only significant change was the departure of Alexander Schwolow, whose contract expired after two years at the club and who declined an extension .
The defining problem emerged not from the hierarchy but from the numbers behind it. By early November 2026, Rønnow had made six Bundesliga starts and conceded fifteen goals, a rate of 2.50 per game. His save percentage stood at 63.4%, and he had kept only two clean sheets in six matches . These were not the statistics of a goalkeeper performing poorly in isolation; they were the statistics of a goalkeeper playing behind a defence that was being systematically exposed. Union’s squad total for the season painted an even starker picture: eighteen goals conceded in seven matches, a save percentage of 59.1%, and a goals-against average of 2.57 .
The defining tension of Union’s goalkeeping season is therefore one of exposure and insulation. Rønnow remains a capable Bundesliga goalkeeper—his 2025/26 campaign, in which he made 30 starts and faced 131 shots on target, was a testament to his durability and resilience under pressure . But a goalkeeper who faces an average of nearly seven shots on target per game, as Rønnow did in his first six appearances this season, cannot be expected to keep his team in matches indefinitely . The question is not whether Rønnow is good enough, but whether Union’s defence is good enough to allow his quality to matter.
This is the story of Union’s 2026/27 goalkeepers: a veteran number one whose statistics reflect his team’s struggles more than his own, a backup whose sole appearance ended in three goals conceded, and a club that has chosen continuity over renewal at the position most dependent on the players around it.
Tactical Context
Union Berlin under Mauro Lustrinelli are a team in transition, and the goalkeeping role reflects that instability. Rønnow is not asked to be a sweeper-keeper in the modern elite mould, nor is he expected to initiate attacks with precision distribution. His role is more traditional: organise the defence, command his box, and make the saves that a mid-table Bundesliga side requires.
The statistics from Rønnow’s 2025/26 season illustrate the demands placed upon him. He faced 131 shots on target in 30 Bundesliga appearances, saving 75 of them—a save percentage of 58.8%. He conceded 54 goals, an average of 1.84 per game, and kept only five clean sheets . These are not the numbers of an elite goalkeeper, but they are the numbers of a goalkeeper who is constantly under fire. Union’s defensive structure, whatever its intentions, was not protecting him.
The tactical question Lustrinelli inherited was how to reduce that exposure. The early evidence of 2026/27 suggests he has not yet found an answer. Rønnow’s fifteen goals conceded in six matches, and Raab’s three in his single appearance, reflect a defensive unit that is being pulled apart regardless of who is between the posts . The goalkeeper is the last line of defence, but he is not the only one.
The Goalkeepers
Frederik Rønnow
Rønnow is Union Berlin’s anchor and the player upon whom the club’s defensive stability has rested for half a decade. The 34-year-old Danish international, born in Horsens, joined from Eintracht Frankfurt in July 2021 and has since made over 150 appearances for the club . His contract situation was not listed with a specific expiry date in squad registries, but at 34, he is entering the final phase of his career at the top level.
His profile is that of the experienced, reliable Bundesliga goalkeeper: commanding in his box, secure in his handling, and capable of the occasional spectacular save without being defined by them. His 2025/26 statistics—30 starts, 54 goals conceded, five clean sheets, 58.8% save rate—reflect a goalkeeper who faced a high volume of shots and saved a reasonable proportion of them . His 2026/27 numbers are worse, but the sample is small and the defence in front of him has been worse still .
The question for Rønnow this season is not whether he remains the first choice—he clearly does—but whether he can sustain his performance level behind a defence that is not protecting him. At 34, his reflexes and recovery speed are inevitably declining, and the volume of shots he is facing accelerates that process. Union’s season may depend on whether Lustrinelli can reduce the burden on his goalkeeper before the burden becomes unsustainable.
Matheo Raab
Raab is the backup, a 27-year-old German goalkeeper who joined from Hamburger SV in July 2025 and has made just two competitive appearances for the club . His one Bundesliga start this season, in which he conceded three goals from three shots on target, was a brutal introduction to the realities of Union’s defensive situation .
His profile is that of the developing number two: 1.86 metres tall, right-footed, and with limited top-level experience. His 2025/26 campaign at Union yielded one Bundesliga appearance and one clean sheet, a 41-minute cameo in which he was not beaten . That brief glimpse suggested competence; the 2026/27 appearance suggested that competence is not enough when the structure around him collapses.
The question for Raab is whether he is being groomed as Rønnow’s eventual successor or merely serving as a placeholder. At 27, he is at an age when goalkeepers typically need regular football to develop. His lack of opportunities at Union suggests that the club views him as a deputy rather than an heir.
Carl Klaus
Klaus is the emergency option, a 32-year-old German goalkeeper who joined Union in July 2024 and has made a handful of appearances as the third-choice keeper . His most notable contribution came in the 2025/26 season, when he made his Bundesliga debut after Rønnow suffered a muscle injury in the closing weeks of the campaign .
His profile is that of the experienced squad goalkeeper: capable of stepping in when required, professional in his approach, and content with a supporting role. At 32, he is not a long-term solution, but in a squad as thin as Union’s at the position, his presence offers a measure of insurance.
The Numbers Game
TABLE A: Union Berlin Goalkeeper Bundesliga Statistics (2026/27, as of November)
| Player | Apps | Starts | Minutes | Goals Conceded | Save% | Clean Sheets |
|---|---|---|---|---|---|---|
| Frederik Rønnow | 6 | 6 | 540 | 15 | 63.4% | 2 |
| Matheo Raab | 1 | 1 | 90 | 3 | 0.0% | 0 |
TABLE B: Union Berlin Goalkeeper Unit – Key Metrics (2026/27)
| Metric | Value | Context |
|---|---|---|
| Squad Goals Conceded | 18 | In 7 Bundesliga matches |
| Squad GA90 | 2.57 | Among division’s worst |
| Squad Save% | 59.1% | 26 saves from 44 shots on target |
| Rønnow 2025/26 Save% | 58.8% | 75 saves from 131 shots on target |
| Rønnow 2025/26 Goals Conceded | 54 | In 30 appearances |
| Schwolow Departure | Contract expired | Declined extension |
Figures from FBref and TAG24 .
TABLE C: Goalkeeper Career Context & Pedigree
| Player | Nationality | Previous Clubs | Style Profile |
|---|---|---|---|
| Frederik Rønnow | Denmark | Eintracht Frankfurt, Brøndby, Horsens | Experienced, resilient, under-fire |
| Matheo Raab | Germany | Hamburger SV | Developing, unproven at Bundesliga level |
| Carl Klaus | Germany | Various | Emergency cover, experienced squad option |
Tactical Identity & Squad Balance
Union Berlin’s goalkeeping unit reflects a club that has prioritised continuity over investment. The decision to retain Rønnow as the undisputed number one, to sign Raab as a young deputy, and to keep Klaus as emergency cover was a low-cost strategy at a position where stability is often more valuable than star quality.
The vulnerability identified by the early season is not the quality of the goalkeepers but the structure in front of them. A goalkeeper who faces nearly seven shots on target per game, as Rønnow has this season, is being set up to fail . The squad’s overall save percentage of 59.1% is poor, but it is a reflection of the volume and quality of chances being conceded, not solely of the men between the posts.
The broader question is whether Union’s defensive problems are systemic or personnel-related. Rønnow’s 2025/26 statistics—54 goals conceded in 30 games, a save percentage of 58.8%—were also underwhelming, suggesting that the issue predates this season . If the defence cannot be fixed, no goalkeeper will thrive. If it can, Rønnow has shown enough over his five years at the club to suggest he can still perform at the required level.
The Verdict from the Camp
FBref, on Rønnow’s 2025/26 season:
“30 starts, 2,640 minutes, 54 goals conceded, 75 saves, 58.8% save percentage, 5 clean sheets.”
FBref, on Union’s 2026/27 goalkeeping statistics:
“Squad total: 7 matches, 18 goals conceded, 26 saves, 59.1% save percentage, 2 clean sheets.”
TAG24, on Schwolow’s departure and the search for a replacement:
“Union Berlin has apparently already found a replacement for backup keeper Alexander Schwolow. According to Berliner Kurier, the Eisernen are targeting Elias Bethke (22) from Energie Cottbus. The 22-year-old is planned as the number two initially, but could replace Frederik Rønnow in the long term.”
Where Next?
Union’s goalkeeping priority is clear: they need the defence in front of Rønnow to improve, or they need to accept that their goalkeeper will continue to face a volume of shots that no player at his age can sustain. The first is a coaching and recruitment challenge that extends far beyond the goalkeeping department. The second is a recipe for decline.
The succession question is not urgent but it is approaching. Rønnow is 34, and his contract situation will eventually demand resolution. Raab has not shown enough in his limited opportunities to suggest he is the heir. The club’s reported interest in Elias Bethke, a 22-year-old from Energie Cottbus, suggests that Union’s recruitment team understands the need to plan for the future, even if the present remains unresolved .
For now, Union’s goalkeepers are a unit defined by exposure: a veteran number one whose statistics reflect his team’s failings more than his own, a backup whose one appearance this season ended in three goals conceded, and a club whose survival may depend on whether the defence can be rebuilt before the goalkeeper is worn down.
