Jonathan Calleri is determined to leave West Ham United this month and blames the club for his Premier League nightmare, sources have told ESPN FC.
But West Ham manager Slaven Bilic says the striker should put the struggling club's needs before his desire to leave England.
Calleri joined West Ham on a season-long loan deal from Uruguay's Deportivo Maldonado in August, but he is yet to start a Premier League game or score in nine appearances.
Sources said Calleri feels he has no chance of playing for West Ham again, and wants to return to Sao Paulo -- where he spent the first six months of last year on loan with the Brazilian side and was top scorer in the Copa Libertadores -- or move to La Liga.