Sullivan revealed to talkSPORT: "It's the manager's decision. He doesn't want to bring in players who are just numbers, just squad players. He wants to bring players in who will improve the team.
"We have a number of bids in for a number of players, but teams don't want to lose them; these are key players at decent sized clubs, outside the UK. They don't want to lose them so whether we get any of these players I do not know."