Kiel reached the Bundesliga for the first time in their history during the 2024-25 season, but their stay was short-lived, as they'll now be sent back down to the second division for the 2025-26 season.
22-year-old Tolkin made eight starts for the club, recording two assists. He missed four matches across February and March with muscular problems.
Internationally, he has four caps, most recently playing for the senior team in January 2024. Last summer, he helped the U.S. U23 team to a quarterfinal appearance at the Paris Games.