Mansfield are waiting to discover the extent of the knee injury Chris Clements sustained against York.
Clements was forced off two minutes before half-time in the Stags' 2-1 victory at Bootham Crescent on Saturday.
It is thought the midfielder has medial ligament damage but the Sky Bet League Two club are still awaiting the results of scans.
"Chris injured his knee and it's not looking a good one. It could be a medial ligament," said manager Paul Cox.
"I feel sorry for the kid as he has been patient and worked hard and has been playing well for us. But, as one door closes, another opens and we have a squad of players champing at the bit."