Manchester United goalkeeper Ben Foster knows he must take the chances that come along when he is given a rare first team start. The 25 year old could face Blackburn Rovers in the Carling Cup quarter final on Wednesday.

He said: "I have got to take any chance that I am given. United are in a lot of competitions, like the Carling Cup which gives the manager a chance to make changes.

"There are also other Premier League games where he might rotate a little bit and give either myself or Tomasz a chance.

"I just have to get my head down and keep doing the same things in training. Then if my chance comes along, hopefully I will be ready to take it."

After establishing himself as the first choice while on loan at Watford, Foster admits that being a back-up takes some getting used to.

He said: "Yes it probably is harder when you only come in for one game every few weeks.

"When you are the established No.1 keeper, you know you are going to be playing, you know what to expect and you can tailor your week to prepare.

"When you don't know whether you are going to be playing, or even involved it is hard to prepare.

"You have to be professional, do the right things in training and be ready when the call comes."