Alexandre Pato has said it will be "very difficult" for him to remain in Brazil as he remained coy on his future amid speculation he could join Barcelona or a Premier League club in January.
Corinthians forward Pato, 26, has been on loan at Sao Paulo since 2014 but the deal is due to end next month and he has been linked with clubs including Barca, Tottenham and West Ham.
Corinthians have said they want to sell Pato and the former AC Milan star now appears set for a return to Europe.
Sao Paulo manager Juan Carlos Osorio on Wednesday confirmed he will be leaving the Brazilian league club to coach the Mexico national team.
Sao Paulo had announced the move on Tuesday, with club president Carlos Miguel Aidar saying in a statement: "I deeply regret Osorio's decision. He was doing a good job."
Mexico's national team director Santiago Banos had already mentioned his desire to choose a new coach by the end of this week, although the Mexico federation had not yet officially confirmed...