The Argentina defender has put pen-to-paper on a four-year deal.
Heinze, 29, had made it clear he wanted to leave Old Trafford but his attempt to force a move to Liverpool failed when a Premier League arbitration panel refused his request.
<SPAN =norm12>REAL MADRID have signed Manchester United defender Gabriel Heinze.
The Argentina defender has put pen-to-paper on a four-year deal.
Heinze, 29, had made it clear he wanted to leave Old Trafford but his attempt to force a move to Liverpool failed when a Premier League arbitration panel refused his request.