The 26 year-old, who signed a five-year contract on his arrival from Manchester United in July 2009, has struggled to build a relationship with chief executive Garry Cook and manager Roberto Mancini since the sacking of Mark Hughes last year.
It is understood that the written transfer request was submitted several days ago and ahead of Saturday's 3-1 victory over West Ham United, which Tevez missed through suspension, and which lifted the club to second in the Premier League table.
The revelation that their leading player and figurehead wants to now quit exposes the tensions at City and will be a severe test for Mancini.
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Tevez requests transfer from Man City
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