Sunderland chairman Niall Quinn says they'll do extensive homework on all their new signings this summer.

He said: "It is still a little bit early for anything to be breaking, and it is good that hasn't come out.

"But to sign a player these days is a difficult, difficult thing. A lot of things have to fall into place and happen.

"We are working ever so hard for them to fall in a few other areas as well.

"But just to reiterate, we are not going to sign players for the sake of signing them, we are going to sign players Roy feels will make a huge difference and will wear the club colours with a pride the fans would be really happy about.

"A lot of work goes into getting all that kind of thing to fall into place, we don't just answer calls from agents and watch videos.

"That day has gone at Sunderland, we don't do that."