The Black Cats have already brought in defender Daniel Ballard and re-signed winger Jack Clarke, while Patrick Roberts, Bailey Wright and Lynden Gooch have all agreed new deals.
Yet it remains clear that Sunderland are short of striker options as back-up for Ross Stewart, while they are also looking to strengthen at full-back.
There is also a need to sign another goalkeeper, with Anthony Patterson the only senior option between the sticks.
Here are some of the players who have been linked with a move to the Stadium of Light this summer.
There is also a need to sign another goalkeeper, with Anthony Patterson the only senior option between the sticks.