Kacper Potulski, an 18-year-old Polish defender, is at the center of a transfer race involving Bayer Leverkusen and Newcastle United, with initial contact already reported according to Meczyki.pl. The Mainz player, who made his Poland debut in May 2026 and scored in a 2-2 draw against Nigeria, has drawn attention from Premier League and Bundesliga clubs following a breakout season.
Clubs in the Hunt: Leverkusen and Newcastle Take Center Stage
Bayer Leverkusen and Newcastle United are the latest major clubs to enter the fray for Potulski, joining earlier interest from Borussia Dortmund, which reportedly offered 25 million euros in January 2026 according to Przegląd Sportowy. While Dortmund’s bid was rejected, the 18-year-old’s growing reputation has intensified competition. Leverkusen has already initiated talks with Mainz, while Newcastle’s scouts have reportedly been monitoring his progress as noted by SportoweFakty.
The lack of a release clause in Potulski’s contract, which runs until June 2028, complicates transfers. Mainz, which signed him from Legia Warsaw in 2023, is expected to demand a significant fee if sold before 2028 according to Transfery.info. This creates a challenge for pursuing clubs, as direct negotiations with Mainz will be necessary.
Potulski’s Rise: From Legia to Bundesliga Stardom
Potulski’s journey from Legia Warsaw to Mainz has been rapid. After joining the German club in mid-2023, he transitioned from the reserves to the first team, earning 23 Bundesliga appearances in the 2025-26 season. His performances, including a goal against Bayern Munich and a match-winning assist, caught the eye of scouts as reported by Goal.pl. His 2025-26 campaign saw 29 total games, one goal, and two assists across all competitions.
The Polish Football Association recognized his potential by calling him up to the national team in May 2026, where he scored his first goal in a friendly against Nigeria. Analysts highlight his composure under pressure and tactical awareness, traits that have made him a target for top-tier clubs according to Przegląd Sportowy.
The Financial Landscape: Valuations and Transfer Dynamics
Transfermarkt values Potulski at 18 million euros, but sources suggest clubs may pay more if negotiations intensify. Dortmund’s 25 million euro offer in 2026 was seen as a benchmark, though Mainz’s reluctance to sell has kept the market volatile as noted by SportoweFakty. The absence of a release clause means any deal would require Mainz’s approval, potentially driving up the price.
Financial experts caution that clubs must balance ambition with realism. “Mainz has no incentive to sell unless the offer is exceptional,” said a Bundesliga analyst. “Potulski’s contract structure gives them leverage, but the clubs chasing him are willing to pay a premium for a young defender with his upside according to Transfery.info.”
What’s Next for Potulski? A Summer of Uncertainty
The coming months will be critical for Potulski’s career. After a short break following the 2026 season, he is expected to return to Mainz for pre-season training. However, the club’s stance on transfers remains unclear. “We’re focused on the next campaign,” a Mainz spokesperson said. “Any discussions about transfers will come later according to Meczyki.pl.
