Sunderland are among Premiership clubs monitoring Nikola Zigic's situation at Valencia.
Zigic's agent Milan Calasan is planning to fly to Valencia in the coming days to hold talks with the club.
He said: "The player has a contract with Valencia and would like to do well there, but that will depend upon whether or not the board and the coach count on him.
"But in the next two weeks, when things are slightly clearer, I will go to Valencia and deal with the situation."