York City forward Michael Coulson has been ruled out for the rest of the season after scans showed he will need surgery on a cruciate ligament injury.
The 24-year-old, who joined the Minstermen from Grimsby in the summer, had scored four goals in 14 league appearances so far this campaign.
York boss Gary Mills told BBC Radio York: "It's bad news for Michael and very bad news for us.
"He's been through it before and we know he'll bounce back."
Meanwhile, Peterborough midfielder Daniel Kearns has extended his loan spell at Bootham Crescent by a further two months.
Kearns, 21, has made five appearances for the League Two side and is eligible to play in Saturday's FA Cup first round tie against AFC Wimbledon.