Celtic have suffered a huge blow to their title chances after losing Shaun Maloney for up to four months.
Manager Neil Lennon confirmed on Friday that the forward had undergone ankle surgery.
Lennon also revealed that defender Glenn Loovens would be missing for a month with a medial knee ligament injury.
Maloney suffered the injury in the early stages of Celtic's 2-2 draw against Inverness on November 27, when he had a close-range shot smothered by Ryan Esson, limping off moments later.
"He had surgery on Monday," Lennon said. "It was a simple procedure but he will be out for a length of time. We are looking between three and four months. It's a huge blow for us and obviously a huge blow for the player."
The injury is the latest in a long line to hit Maloney, who had been wearing the Celtic armband while Scott Brown recovers from a broken metatarsal.
The 27-year-old did not play after October last season after being struck by an tendonitis problem in his ankle before suffering a number of niggling injuries.
The Scotland international also missed four months of the previous season with a persistent hamstring problem.
Loovens has not featured since the Co-operative Insurance Cup victory over St Johnstone in October after paying the price for some defensive errors.
Lennon revealed the Dutchman would be missing for a month with an injury picked up in training.
Source: PA
