The Argentina attacker sees his two-year loan spell finish at the end of the season and the Red Devils had the option to complete a £30m deal in January.
But with Tevez failing to convince Sir Alex Ferguson of his goalscoring ability - plus the arrival of Dimitar Berbatov last summer - it seems his Old Trafford days are numbered.
There is no shortage of interest in the former West Ham star across Europe and his advisor, Kia Joorabchian, has admitted Tevez's third-party owners are "studying other options".
Real, Inter and even mega-rich City have been linked, and Joorabchian told the Daily Star: "Carlos is in the market now that United have not made any move for him.
"We are now studying other options and interested parties. There is no option left with United any longer."