The 27-year-old is yet to make an appearance for United's first team in pre-season after suffering a hamstring injury just days into their tour of Asia and then damaging his shoulder in a behind-closed-doors friendly against Real Betis last week.

However, he has been selected regardless for the Wembley clash, and insists he is looking forward to playing.

Rooney posted a message on his official Facebook page before Rio Ferdinand's testimonial on Friday evening, which the striker was not involved in, and did not attend.

Chelsea have been strongly linked with a move for the England international, who has less than two years to run on his current Old Trafford deal.

Former United boss Alex Ferguson revealed Rooney had asked to leave the club at the end of last term, and Jose Mourinho's side have already seen bids rejected, reportedly against the forward's wishes.

"Can't wait to join up with the England squad and hopefully play in a competitive match, they always are against Scotland," he wrote.

"Big thanks to Roy Hodgson for selecting me and showing his faith and support, appreciate it."

Rooney scored 16 goals in 37 games last season for United, but found his opportunities limited by the arrival of Robin van Persie, who has firmly established himself as United's first-choice striker.

Moyes has already confirmed the Dutchman will be his main attacker in his first season in the Old Trafford dug-out, which is thought to have only cemented Rooney's desire to depart.