Scunthorpe United defender Scott Wiseman could miss the rest of the season after having knee surgery to remove a bone growth.
The Gibraltar international, 30, has played 29 games for Scunthorpe since arriving from Preston in May 2015.
"It's sort of appeared out of nothing," boss Nick Daws told the club website.
"It's pretty much a standard procedure, but because of the invasiveness of the surgery, it will rule him out for probably the remainder of the season."
Scunthorpe are 13th in the League One table, seven points outside the play-off places.