Alan Pardew has tried to employ him in a more central role in recent weeks, but agent Alex Gontran claims it is that change which has upset his client.
He said: "How could you put your best striker with full confidence on the left wing?
"The choice to put Demba on the left last season was good for the club because Cisse scored 13 goals.
"But there was a lack of recognition for Demba. It is more difficult to play well when you don't have the confidence of your staff.
"Demba is happy at Newcastle. He is playing in the Premier League with lot of fellow French speakers and he loves the club's supporters.
"He would like to start every game, but he respects the choice of the coach, even if he does not always understand or agree."