Celtic have identified FC Koln's 23-year-old German defensive midfielder Eric Martel as a target before the summer transfer window. The club is looking for new players for its midfield, where key players have been linked with moves away, and Martel is viewed as someone who could potentially provide support for captain Callum McGregor. Martel, who joined his current club in July 2022, has a contract that runs until June 2026 and has been capped 30 times for Germany's U21 team, scoring three goals. In the 2025/2026 Bundesliga season, he has made 1 appearance, scoring 2 goals and providing 7 assists. His market value is estimated by Transfermarkt to be €8.00m.