Manchester United boss Sir Alex Ferguson fears that Wayne Rooney
could miss the Champions League second-leg match with AC Milan on Wednesday.The striker was unavailable for United's 1-0 win over Wolves at Molineux after aggravating a knee injury playing for England in midweek. [LNB]"He's a doubt for Wednesday, which is a bigger problem for us," said Ferguson. [LNB]"It wasn't looking good when he got back on Thursday - his knee was swollen," added the United boss. [LNB]United coped without Rooney in the win at Molineux, with Paul Scholes scoring the solitary goal in a hard-fought win that took the Red Devils to the top of the Premier League table.[LNB] It is hard to quell the enthusiasm of people like Wayne Sir Alex Ferguson United are already without striker Michael Owen, who has been ruled out for the rest of the season with a hamstring injury. [LNB]The 24-year-old Rooney had been struggling with the knee problem before last weekend's Carling Cup final but still played in England's win over Egypt on Wednesday at Wembley, much to Ferguson's chagrin. [LNB]"I don't think he should have played on Wednesday," said Ferguson. [LNB]"It is his own enthusiasm that has caused it. His problem is that he can't say no." [LNB]"He told us on Sunday he was feeling his knee. Then all of a sudden people put an arm around his shoulder with England and he wants to play. [LNB]"[England boss] Fabio Capello has to pick his best team. A win was important so I don't blame him at all. [LNB]"I was more disappointed with Wayne. Why didn't he come off? I can't believe it."[LNB] I hate international friendlies every week u! Rooney was a substitute in United's 2-1 Carling Cup win over Aston Villa, but came on after Owen pulled up with the hamstring injury and scored the winning goal. [LNB]Rooney admitted to a knee problem after the match but still played 86 minutes in England's 3-1 victory over Egypt on a Wembley pitch which has drawn widespread criticism over the last week. [LNB]The turf was seen to cut up last Sunday leading to Ferguson partly blaming it for Owen's hamstring injury. [LNB]Rooney has been a key figure for United this season, scoring 27 goals this season, including two in United's 3-2 first-leg win in Italy, while he leads the Premier League scoring charts with 23 goals. [LNB]"It is hard to quell the enthusiasm of people like Wayne," Ferguson added. [LNB]"He is restless. He can't sit down. He is always on the move. Even in hotels he is moving from one table to another. If we are away in Europe he is walking about all the time. [LNB]"You don't want to take away from him but age does some good things for you. [LNB]"Eventually you see you can't be doing this running about all the time. You have to take a rest sometimes."