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If he comes back for the whole and doesn't at least win a race, he'll have basically failed.
.Its gonna be great having Schumi in a Merc.... i wont have to hate him now
Le coeur a ses raisons que la raison ne connaît point. 
Michael Schumacher signs up for F1 return with Mercedes
Schumacher aborted a comeback attempt last season because of a neck injury
By Andrew Benson
Seven-times Formula 1 world champion Michael Schumacher will come out of retirement to race for Mercedes next year, BBC Sport understands.
The German, who will be 41 on 3 January, has signed a contract and the deal will be announced imminently.
Schumacher will partner compatriot Nico Rosberg in the team that won the drivers' and constructors' titles in 2009 in its former guise as Brawn.
His spokeswoman Sabine Kehm said she could not make any comment.
Schumacher's decision will reunite him with Mercedes team principal Ross Brawn, who masterminded all seven of his titles, the first two with Benetton in 1994-5 and the subsequent five with Ferrari from 2000-4.
The German newspaper Bild is reporting that Schumacher has signed a one-year deal.
606: DEBATE
I don't like Schumacher but it's a great boost for F1 if he does return
KimiRaikkonen1
Mercedes are known to want German rising star Sebastian Vettel in the long term, but the 22-year-old is contracted to Red Bull until the end of 2012.
Schumacher was forced to call off a planned temporary comeback as a stand-in for injured Ferrari driver Felipe Massa last season because of a neck injury sustained in a motorcycle accident last February.
But Schumacher is known to have had medical checks recently and it must be assumed he has been given the all clear as he would not want to face the same embarrassment again.
He signed a revised contract as a consultant for Ferrari recently, but he told Ferrari president Luca di Montezemolo that he was "very close" to concluding a deal to race for Mercedes.
Ferrari have had to release him from his contract to enable him to race for Mercedes.
His comeback is the most high profile in F1 since Austrian Niki Lauda came out of a two-year retirement for the 1982 season to race for McLaren.
Lauda, who was 33 at the time, went on to win a third world title in 1984.
He's not at the peak of his game, but he's still good enough to win races
Eddie Irvine
Schumacher has been training hard in preparation for a return and, assuming his neck is fully healed, is not expected to have any problems with fitness.
His former team-mate Eddie Irvine told the BBC last week that he expected Schumacher would win races, even though he would not be as powerful a force as before.
"The speed will be there, though he won't be as fast as he was seven years ago," Irvine said.
"He's not at the peak of his game, but he's still good enough to win races as he has such an immense talent. It's still four wheels, a steering wheel and an engine and there's never been anyone better than Michael."
Irvine said he thought Schumacher would be at a disadvantage in wheel-to-wheel racing compared to the younger generation of drivers such as 2008 world champion Lewis Hamilton.
"Lewis isn't going to back off, but Michael will have to because he'll be 41," Irvine said.
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