Carlo Corazzin, David Miskelly, Duncan Roberts and Wayne Gill have all been released by Oldham.
Wijnhard must undergo an operation
The four were among twelve players who are out of contract this summer.
Wayne Andrews and David Eyres are thought to have been offered new contracts and Lee Duxbury is set to join the coaching staff.
But Clyde Wijnhard is to undergo a knee operation and Oldham will await the results before deciding his future.
Darren Sheridan has an option to extend his current deal for another season and talks will take place with John Eyre, Tony Carss and Julian Baudet next week.