**Manchester United boss Sir Alex Ferguson says Wayne Rooney has himself to blame for the knee injury that could rule him out of the trip to Wolves.**Rooney, 24, had been struggling with the problem before the Carling Cup final but still played in England’s 3-1 over Egypt on Wednesday at Wembley.
“I don’t think he should have played [on Wednesday],” said Ferguson.
“It is his own enthusiasm that has caused it. His problem is that he can’t say no,” he added.
"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.
"[England boss] Fabio Capello has to pick his best team. A win was important so I don’t blame him at all.
“I was more disappointed with Wayne. Why didn’t he come off I cant believe it.”
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Rooney was a substitute in Manchester United’s 2-1 win over Aston Villa last Sunday but came on after a first-half injury to Michael Owen to score the winning goal.
He admitted to a knee problem after the match but still played 86 minutes in England’s victory over Egypt on a Wembley pitch which has drawn widespread criticism over the last week.
The turf was seen to cut up last Sunday leading to Ferguson partly blaming it for Owen’s hamstring injury which has ruled him out for the rest of the season.
Aston Villa’s James Milner also described it as “one of the worst pitches you play on all year”.
Rooney has been vital to Manchester United this season and leads the Premier League scoring charts with 23 goals.
They take on Wolves on Saturday at 1730 GMT looking to leapfrog Chelsea at the top of the Premier League with the champions currently one point behind their title rivals.
But Arsenal, who play Burnley, could be top of the table when Manchester United kick-off as they play the Clarets earlier in the day.
“It is hard to quell the enthusiasm of people like Wayne,” Ferguson added.
"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.
"You don’t want to take away from him but age does some good things for you.
Eventually you see you can’t be doing this running about all the time. You have to take a rest sometimes."*