pbr Sir Alex Ferguson insists Wayne Rooney did not suffer any long-term damage as Manchester United bowed out of the Champions League on away goals.br ppbr Ferguson took a calculated gamble to risk Rooney's ankle injury against Bayern Munich at Old Trafford and confirmed afterwards his star striker had aggravated the problem during a 3-2 win that condemned United to an exit at the quarter-final stage.br ppbr Rooney is now likely to miss Sunday's trip to Blackburn, the start of a five-match title run-in in which Ferguson believes his side cannot drop a single point if they are to stand any chance of retaining their Premier League crown.br ppbr However, the United boss is confident his 34-goal forward will be fit for the derby trip to Manchester City on April 17.br ppbr "He got a knock which was similar to last week," said the United boss.br ppbr "It is a burst blood vessel below the ankle. He won't be out for too long.