Fletcher collected a knee injury last month against Croatia, which infuriated manager Sir Alex Ferguson.
"George Burley wanted to make an impression as it was his first game in charge.
"Injuries are part and parcel of the game and I am a believer things happen for a reason. Hopefully, I will come back stronger as I want to help Manchester United and Scotland achieve success.
"It is like when you are a kid, you just want to play football. There is nothing better than going out there and pitting your wits against other teams. It is a challenge and I want to do it anytime I can."