The future of Sunderland quartet Denver Hume, Luke O'Nien, Aidan McGeady and Charlie Wyke remains up in the air. 

All four players have been offered fresh terms at the Black Cats as Lee Johnson prepares to assemble a squad that will battle for League One promotion next season. 

Discussions have taken place with the quartet and their representatives, but all four players are free to speak to whoever they please and it is understood that at least three are aware of strong competing interest from elsewhere.

Wyke is understood to be in high demand after netting 31 times in a Sunderland shirt last season while O'Nien has recently been linked with a move to Middlesbrough. 

None of the four have tied themselves down to fresh terms at the Stadium of Light yet which may be a cause of concern to the club's hierarchy. 

It's understood that a clean slate of players at the club would bring a new lease of life to the squad ahead of fourth consecutive season in League One football. 

However, Hume, O'Nien, McGeady and Wyke were all part of a core group of players that the club are keen to keep hold of. 

Meanwhile, Sunderland's hopes of re-signing Dion Sanderson received a fresh boost recently. 

It's understood that Wolves have signalled their willingness to sell the centre-half, who spent last season on loan at the Stadium of Light.

However, Johnson may well face competition from several Championship sides for his signature after impressing on loan last season. 

While the Black Cats will have to work within a fairly strict budgetary limit this summer, there should be scope to meet Wolves’ asking price, which is likely to be around £2m.