The Argentina international told a radio station that he still wants out, despite the City manager's comments on Tuesday night that suggested he had told Mancini he would be happy to stay.
The timing of the interview suggests Tevez's camp are still set on forcing his exit from Manchester and directly undermines the boss on the day he faces the press for Sunday's pre-match press conference.
Tevez handed in a transfer request last December, only to then backtrack and commit himself to the City cause after top-level talks.
The 27-year-old wants to finish his career back at Boca Juniors but admits that they could not possibly pay City enough to pull off the deal, although Inter Milan may have the financial muscle to strike a deal.
"I want to leave Manchester City," Tevez, told Argentine station Radio del Plata.
"Football has changed a lot for me and I don't know if I will even make it to the next World Cup. And that has nothing to do with whether I'm selected or not.
"I've been treated very well here and I'm grateful.
"I also gave my everything for the club to receive the results it has had. But I need a change of scene."