Manchester United boss Sir Alex Ferguson admits his team's wastefulness in front of goal is a concern.

Fergie admitted: "The missed chances are becoming a concern.

"Against Portsmouth and against Derby, we were really charitable.

"It's a sticky spell that we must get over because we've got big games coming up - against Bolton and then Liverpool at home.

"We want to start taking our chances. If we start taking them then someone is going to suffer. We'll just have to keep going at that."