Aaron Downes, who had returned from an eight-month absence with ligament damage, was forced off against Port Vale on February 9 after suffering another injury to the same knee.
The Australian centre-half will see a specialist in the near future but early indications are he is unlikely to play again this season.
Striker Jack Lester is still recovering from knee surgery and is not expected back until the end of March or early April.
Source: Team Talk
Source: Team Talk