After wasting opportunities in the Champions League midweek, Manchester United boss Sir Alex Ferguson has asked his players to take more care in front of goal.

"It is a concern," said Ferguson.

"It could be carelessness, it could be anything. But we are missing too many chances and we have done it again.

"If we don't start taking these opportunities at some point we are going to get embarrassed. Fortunately it didn't happen (against Aalborg) but if we are not careful we will get a defeat when we need a win."