The 27-year-old has been out of favour and has only played 36 minutes of Serie A football this season from the bench, while not featuring at all in the Champions League.
Muntari has been linked with a switch to Napoli but his agent Marco Odisio is not ruling out a move overseas after Muntari looked to leave Italy in the summer.
"Before the beginning of the season Inter have made some choices that probably didn't include Sulley," Odisio told www.radiocrc.com.
"He was in great shape, he has not been included in the Champions League list because of some choices made by the club.
"In June he had the opportunity to move to an English club, but finally this possibility has vanished.
"Sulley really wants to play, he was quite upset about missing the possibility to move to England because he wanted to play abroad.
"Today he seems like a player that Inter are not considering."
Odisio did not confirm if Napoli had expressed firm interest in the Ghana international, but revealed an offer would be seriously considered.
"(There has been) nothing concrete," he added. "Of course we are happy about these rumours and if there would be a real interest I am sure that he would evaluate the possibility to move to Naples.
"At the moment we are evaluating some offers made by foreign clubs, but Napoli would be an interesting alternative".