Sunderland chairman Niall Quinn has called for his club's fans to be patient as he and manager Roy Keane try the strength the Black Cats squad.
Quinn's club have been linked with a number of players this summer, including Celtic winger Aiden McGeady, but no deals have been completed as yet.
"A lot of things are happening behind the scenes," Quinn told the Sunderland Echo.
"People are probably waiting and anxious that we make signings, but we have to do it properly and we have to get quality.
"There is no point in signing players to keep people happy. We have to make sure we get the ones we are after.
"Roy and I had a good chat the other night looking at the state of play, talking about the various enquiries we have made and what the chances are of achieving the kind of player that we need at the club.
"Roy is adamant that he is keeping his cards close to his chest rather than us talking about things publicly and just disappointing people if they don't come off.
"We are happy to stay silent and people will have to trust us that we are doing the best for the club."