Sunderland boss Gus Poyet has assured fans there's plenty of transfer work going on behind-the-scenes.

Poyet has insisted that he will not give details away of the players he is trying to sign, he has revealed that everything is being done that can be done to bring in new signings.

"There is a lot happening," he told the Sunderland Echo. "But I'm afraid there is nothing to actually report.

"I will say that it is very difficult - you could not imagine.

"People think you just go to a chairman, get a telephone number of a player, ring him and then buy him.

"But it's not like that, it's not like going to a supermarket and buying something. There are so many things that need to come together - the player, the money, the club, the transfer window and so on.

"So that's what we are working on, making lots of calls, doing lots of work but things just don't come together straight away and although that's frustrating, we can only accept it."