Gyan is also now refusing to speak to the Black Cats' manager and a return to Wearside appears to be unlikely due to the strained relationship between the pair.
"I've heard comments he's made since I left which I'm disappointed about," Gyan explained to reporters.
"Because of that I've not called him since I moved here.
"Steve Bruce was aware I was moving. Everybody at the club gave consent to the move because of the money involved."Sunderland are rumoured to have recieved £6 million just for the loan deal, with Gyan reportedly set to pocket £200,000 a week during his spell in the Middle East.
Bruce has been left short of options up front as the deal went through after the Premier League transfer window shut.