Oldham loanees Chris Howarth and Maheta Molango have returned to their parent clubs after the Latics opted not to extend their one-month loan deals.
Goalkeeper Howarth, 20, had moved to Boundary Park from Bolton as cover, and made four appearances before being sidelined by injury himself.
Middlesbrough keeper David Knight has since joined the Latics on loan.
Striker Molango, 24, returns to Brighton after scoring once in six appearances for John Sheridan's side.