Ndong, Djilobodji could be sued by Sunderland

Ndong, 24, joined Sunderland in 2016, though is yet to appear at the club this season and Donald says he has no idea as to his whereabouts. 

Djilobodji, however, has only just returned to the League One outfit and seems particularly unfit. 

Speaking to 'Talksport', Donald admitted:  "I'm certain we're allowed to fine them. But the question is whether they've done enough in breach of their contracts [for us] to terminate their contracts and pursue them for wilfully devaluing themselves.

"Didier Ndong has shown no interest in returning to the football club whatsoever, we don't even know where he is.

"Papy has returned but in his last conversation [before coming back] he said: 'You'll never see me in Sunderland again'.

"There's an obligation on players to turn up in a condition in which you can play football, and the reality of it is that I would probably have beaten his [Dilobodji's] stats when he returned."