Sunderland are looking at Celtic's 22-year-old Belgian midfielder, Arne Engels, but face competition from other Premier League clubs. Fulham are also monitoring the player, while Nottingham Forest remain interested after Celtic rejected their £25 million offer for the Belgian at the end of the last transfer window. Other reports have also linked relegated West Ham United with a move. The midfielder, who has four caps for Belgium, joined the Scottish club in August 2024 from FC Augsburg for a fee of €11 million and is under contract until 2028. In the 2025/2026 Scottish Premiership season, he made 25 appearances, scoring 4 goals and providing 2 assists. In April 2026, Celtic's asking price was reportedly around €25 million, while reports in January 2026 suggested the club would want between €15 million and €20 million. His current Transfermarkt market value is €20.00m.