Lasse Rosenboom has extended his contract with Holstein Kiel. The 23-year-old right-back's contract, originally ending in 2026, has been renewed ahead of time. He has become a key player for the team, participating in 19 official matches this season and playing a crucial role in the DFB-Pokal round against Alemannia Aachen. The club's Sporting Director, Carsten Wehlmann, praised Rosenboom's development and contribution to the team.