Ben Foster looks certain to make his Champions League debut for Manchester United tomorrow night after Edwin van der Sar was rested for the trip to Celtic.

Sir Alex Ferguson has promised both Foster and Tomasz Kuszczak they will be given chances to impress this season, but the England international is the more likely beneficiary of Van der Sar's absence.

United youngster Rafael Da Silva will deputise at right-back after Wes Brown and Gary Neville were ruled out of the game at Celtic Park. Brown has missed United's past two games with an ankle injury and was not at training on Tuesday, while Neville was also left in Manchester as the squad flew out to Scotland on Tuesday afternoon.

Celtic, who lost 3-0 at Old Trafford in October, need a win to maintain their hopes of reaching the knockout stages.

Remarkably, it would only be Foster's second senior appearance for United even though he has been at Old Trafford for over three years.

The first two seasons were spent on loan at Watford and then last term, when he was expected to challenge Van der Sar for a first-team berth, he was ruled out following cruciate ligament surgery.

Foster did make his United debut in March, keeping a clean sheet in a narrow win at Derby County, but because he was not registered for the Champions League, Sir Alex Ferguson decided to place his faith in Kuszczak.

The United boss has previously stated his belief that Foster is England's number one goalkeeper and amazingly, his only appearance at Old Trafford came for his country when he won his first - and so far only - cap against Spain in February 2007.

Manchester United (from): Kuszczak, Foster; Ferdinand, Vidic, Evra, O'Shea, Rafael, Evans; Possebon, Anderson, Fletcher, Nani, Ronaldo, Gibson, Giggs, Carrick, Park; Tevez, Berbatov, Rooney.