Calleri future unclear at Sao Paulo

RIO DE JANEIRO, Feb. 8 (Xinhua) -- Argentine striker Jonathan Calleri says his future at Sao Paulo is uncertain as he enters the final year of his contract with the Brazilian club.

The 31-year-old's current deal is due to expire in December, and he said any decision on a possible extension would be left to the club's board.

"I have to do my part, make myself available to the manager as much as possible an