SIR Alex Ferguson has once again raised the spectre of Dimitar Berbatov heading for a knee operation. Manchester United's record signing opened the scoring in the 3-0 win over Burnley at Old Trafford but left the action early. And Ferguson confirmed the Bulgarian had reported more pain from a knee injury which the United boss revealed only on Friday that his £30.75million striker had vowed to battle through. Dimitar was feeling his knee again, confirmed Ferguson. He played through it today but he could have come off at half-time. We will have to look at it again on Monday and see what the situation is. If Berbatov is forced to go for surgery it will either mean another venture into the transfer market or even more responsibility being placed on the shoulders of Wayne Rooney. It would be a shame too for Ferguson, given how impressed he was with the Bulgarian's efforts. He was the player who looked most like scoring today, he said. Ferguson view A couple of shots went just by the post, he also had a couple of headers over the bar. He had so many attempts he was probably relieved to get one in the end. Rooney doubled United's lead with his 16th goal of the season before new-boy Mame Biram Diouf marked his home debut by finding the net late on when he headed Antonio Valencia's cross past Brian Jensen. Yet Ferguson was honest enough to accept Burnley had spurned two decent chances when Steven Fletcher and David Nugent failed to find the target after finding themselves clean through when the game was still deadlocked. We could have been embarrassed, he admitted. We had a number of opportunities to punish them in the final third but there was a bit of nervousness and anxiety about our game. You need a goal to open teams up in matches like that, although while they will probably feel 3-0 was unfair, I didn't believe it was too unjust. Ferguson must now turn his attention to Tuesday's Carling Cup semi-final first-leg trip to Manchester City. Darren Fletcher, who was suspended this afternoon, seems certain to start along with Ryan Giggs. But Ferguson confirmed Darron Gibson and the Da Silva brothers, Fabio and Rafael, will also be in contention. What do you think? Have your say.