Manchester United boss Sir Alex Ferguson won't take anything for granted, despite their 2-0 lead over Roma in their Champions League quarterfinal.

He said: "At this moment, it is a fantastic result for us.

"But probably on the day of the game I will start to worry about it.

"The first thing we have to do is prepare properly for the match.

"We cannot take anything for granted with a place in the semi-finals at stake."