The club say they will not sell him in the January transfer window and will seek compensation for breach of contract from his agent and former 'owner' Kia Joorabchian if the 26-year-old retires or refuses to play.
The deal, which has three-and-a-half years to run, is estimated to amount to tens of millions of pounds.
Tevez missed City's 3-1 victory over West Ham on Saturday through suspension and has just returned from a break in Tenerife.
After the European trip to Turin, City host Everton on Monday before matches against Newcastle, Aston Villa and Blackpool over Christmas.
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