Ghanaian admits he no longer speaks to the Black Cats manager after recent coments and says the Premier League club were very keen to do the deal due to the money on offer
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.