League Two side Cambridge United have parted company with four players, including winger Ryan Donaldson.
The 25-year-old made 33 appearances for the U's this season, but has struggled with injury throughout the campaign.
Goalkeepers Chris Dunn and Sam Beasant have also been released, while forward Robbie Simpson leaves by mutual consent after 36 games this term.
Centre-back Josh Coulson, 27, and midfielder James Dunne, 26, have been offered new contracts.
The club have also confirmed they are in talks with 24-year-old striker Jimmy Spencer after he scored six goals in 18 matches since joining in January on a six-month deal.
Midfielder Dylan Williams, 18, has been offered a one-year professional deal, while loan players Darnell Furlong, Ryan Haynes, Shane O'Neill, Ryan Ledson, Max Clark and Zeli Ismail have returned to their parent clubs.