United thrashed the MLS-Allstars 4-0.
"When you don't put chances away against a team like Manchester United, they will capitalise," said the ex-England skipper.
"I had many successful years playing under Sir Alex Ferguson. I wouldn't be where I am today without him. He gave me a chance when I was 16. I owe him a lot. To play against a team that is still managed by him is emotional."