George McEachran, a midfielder for Grimsby Town, will depart the club at the conclusion of his contract in June after failing to reach an agreement on new terms.
The 25-year-old made 79 appearances in League Two during his two seasons with the Mariners.
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Also released are defender Tyrell Warren (27), midfielder Zak Gilsenan (23), and forwards Jason Dadi Svanthorsson (26) and Jude Soonsup-Bell (22).
The club has offered a new contract to 23-year-old midfielder Evan Khourri and activated the option on goalkeeper Sebastian Auton’s contract, who is 19.
Goalkeeper Christy Pym (31) and defender Sam Lavelle (29) are both available for transfer.
Dave Artell’s team finished seventh in League Two this season before being eliminated by Salford in the play-offs.