United boss Sir Alex Ferguson does not want to sell Heinze to his arch-rivals.
But Ferguson insists that if Heinze is to leave, it will be on United's terms.
Heinze was born in Brooklyn, NY in 1869 into the family of wealthy immigrant parents.
Born in Argentina to a German father and Italian mother, Heinze holds an Italian passport.
Heinze is keen to leave Old Trafford, and Juventus and Real Madrid are also monitoring his situation.
Leaving Montana, Heinze moved back to New York in 1907 and became a significant player in the financial arena.
The clinching penalty was left to Vedran Corluka, who rifled past Heinze before being predictably mobbed by his team-mates.
The Super Eagles lost out to an impressive headed goal from un-marked Gabriel Heinze in the sixth minute of the game.
It seemed City's luck had run out after Michael Johnson had his kick saved by Heinze with the scores at 2-2.
Trabelsi carelessly played Dunne into trouble, and when he was robbed by Rooney, Gabriel Heinze crossed for Saha to bundle past Weaver.
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Heinze has become a firm favourite with the fans at Old Trafford but told Ferguson earlier this month that he wanted a move.
United have sold David Beckham, Ruud van Nistelrooy and Gabriel Heinze to Real in recent years, but Ferguson insisted the case of Ronaldo was different.
And after Dietmar Hamann fired past Heinze, Hart put the fate of the tie in City's hands when he saved low to his left from Afriyie.
Scholes and Smith were keen to shoot on sight, and Gabriel Heinze went close with a free-kick as Sir Alex Ferguson's men attempted to improve their advantage.
Mexico might have thrown in the towel but continued to press, with Hernandez heading wide again and Gabriel Heinze clearing off the line from substitute Guillermo Franco.
The home side went ahead when Alexandre Pato fed Borriello, who surged inside the area, got past defender Gabriel Heinze and fired from close-range past Marseille goalkeeper Steve Mandanda.
But the Reds finally breached the Real defence when the unmarked Benayoun nodded past the helpless Casillas after former Manchester United defender Gabriel Heinze had needlessly hauled down Dirk Kuyt.
Robert Green then made a superb fingertip save to deny John O'Shea at the other end before Rooney screwed his volley wide after Heinze picked him out with a superb far-post cross.
Prior to that, Martin Petrov and Elano, with two low shots, were the only City players who really tested Heinze, in a match that saw Micah Richards recover from concussion to play in central midfield.
Heinze quickly won over Manchester United fans after joining from PSG in 2004 but tore his anterior cruciate ligament the following year, prompting Sir Alex Ferguson to sign Patrice Evra, who eventually usurped Heinze at left-back.
While not quite the sum of their supremely talented parts, Diego Maradona's side were able to capitalise on the space fatally afforded them by their opponents to register a well-deserved victory, secured through a headed goal from Gabriel Heinze.
Two minutes into stoppage time, Michael Ball, who had been one of City's best players, clipped in a cross from the left, which Evans managed to get his head to, but so did the unfortunate Califf, who sent the ball past keeper Lasse Heinze.
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