BEN Foster aims to extend Edwin van der Sar's first team absence after overcoming his Wembley woe in the Community Shield.
United's veteran flying Dutchman has been Sir Alex Ferguson's unchallenged first choice since he was signed from Fulham in 2005.
But in his final campaign before his expected retirement Van der Sar now faces the battle of his Old Trafford life.
The 38-year-old suffered a broken finger and bone in his left hand during the pre-season Audi Cup penalty shoot-out with Bayern Munich in Germany.
Surgery has KO'd him for at least eight weeks and handed the initiative to 26-year-old Foster.
"I was happy with my contribution especially after last week. I was disappointed with my personal performance at Wembley," said Foster after the Birmingham win.
"It was good to bounce back and get a clean sheet. The most important thing was to get the three points but to get a clean sheet as well was good for me.
"I have got to give it all I have got now. Unfortunately, Edwin has suffered his injury and will be out for a period of time.
"I have to do what I can in the time that he is out and when he is back and fit again I have to hope I have done enough to stay where I am. The game against Birmingham was a tough match in the end. We had plenty of chances and should have made it a bit more comfortable than it was.
"Both defences played really well. We were happy with three points and a clean sheet.
"I was busier than I expected it to be. The first match is always going to see everyone up for it and you expect a few scares but we looked quite tired in the second half particularly late on and we made it more difficult for ourselves than it should have been."
United have been plunged into an early season defensive crisis with Rio Ferdinand and Nemanja Vidic missing the Birmingham opener with injuries. Both will miss tomorrow's match at Turf Moor against Burnley.
Jonny Evans is also set to be out of the visit to the Premier league newcomers. He was forced off on Sunday with an ankle problem.
Gary Neville and Rafael are both still unfit for action but Wes Brown came on as a sub on Sunday.
But Foster doesn't believe personnel disruptions will weaken the Reds.
"The players who came into defence are great," he added.
"John O'Shea and Jonny were fantastic. Fabio on the right is playing beyond his years. He is a fantastic talent.
"We have the players who can come in and do a job just as well as the others can."
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