Burnley midfielder Chris McCann has been ruled out for the rest of the season after undergoing a knee operation last night. Chris underwent an exploratory knee operation last night which discovered a slight tear in his cartilage which was repaired. He's now been ruled out for four to six weeks which effectively ends his season.Manager Brian Laws said: "Clearly Chris has been frustrated at not being able to recover fully from the knee injury. We therefore decided the only course of action was an operation to assess the problem and what was revealed was a slight cartilage tear."It is clearly a huge blow to lose Chris, as we had hoped to see him back in action by now. But the welfare of the player is uppermost in our thoughts and thankfully the diagnosis is not serious and there is no ligament damage."We are disappointed to lose Chris, but we look forward to him making a full recovery and seeing him back in action, either towards the end of the season or in good time for pre-season."Chris picked up his injury in a challenge with Sunderland's Michael Turner that amazingly went unpunished. That was back in September and his only football since has been the cup tie at Reading and a few minutes in the league game at Bolton.I believe his absence has been a shocking blow to our Premier League season. His presence in our midfield makes all the difference and the loss of Chris McCann has been very crucial.Hopefully, he'll be back to full fitness for the beginning of next season and once again adding his quality to our midfield.