Fedde Leysen, a 22-year-old Belgian defender for Union SG who has been on the bench for weeks and has not played in the Play-Offs, has been linked with several clubs, including Fiorentina, West Ham United, and Napoli. More recently, it has been reported that concrete interest has emerged from the Bundesliga, with VfB Stuttgart, Eintracht Frankfurt, and Bayer Leverkusen monitoring him. It is said that Stuttgart is showing the strongest interest. Leysen has three years remaining on his contract. He is believed to want more playing time and is expected to discuss his future with Union SG's board after the season. In the 2025/2026 Jupiler Pro League, Leysen made 23 appearances, scoring one goal and providing one assist. He has 2 caps for the Belgium U21 national team. His current market value is listed by Transfermarkt as €5.00m. Union SG reportedly demanded over €10 million in August 2025. Separately, reports in April 2026 mentioned a potential fee between €15-€20 million.