From the official site:
'Heinze's international commitments have meant he is yet to kick a ball for United, and his contact with manager Sir Alex Ferguson had been limited to telephone conversation.
Fergie sees the tough-tackling defender as United's left-back for the season.
However, he arrived at Carrington on Tuesday morning and pulled on a United shirt for the first time.
Heinze said recently: "My situation isn't easy. [United's] directors are a bit annoyed, but I always did what I felt was correct and United will be proud to have a gold medal winner in the squad.
"Some people say I did the right thing, others say I didn't. But I'm never going to say 'no' to Argentina.
"I deny I have a bad relationship with them [United]. I want to respond to what has happened through my efforts on the pitch. I'm going to show I can shine in the Premiership.
"I can't wait to play for United," he added.'