But who could the Sunderland owner now turn to? With a number of managers - both experienced and fairly youthful - available for hire, Donald will likely have no shortage of suitors for the vacant role – which is still an appealing one. Here’s 13 managers that Sunderland could line-up to fill the void at the Stadium of Light, with some familiar faces potentially in the frame:
9. PHIL PARKINSON
Parkinson is another with vast experience of League One and, crucially, knows how to get out of the division. He is currently out of work and may well be tempted at another crack at League One - having just left Bolton. Photo: Gareth Copley
10. JAMES FOWLER
Fowler remains at the Stadium of Light, for the time being, after Ross’ departure and, if he can string together a successful run during his caretaker spell, then he could well see himself in contention. Photo: Frank Reid
11. PAUL WARNE
Similarly to Ainsworth, Warne has impressed since taking the reigns at Rotherham United. His side play positive football, something Ross was often criticised for neglecting, but whether he would leave the Millers remains to be seen. Photo: George Wood
12. CHRIS HUGHTON
This would be a real statement of intent. Hughton will undoubtedly be linked with the Stadium of Light but, having spoken of his desire to manage in the top flight, may be out of Sunderland’s range at this time. Photo: Mike Hewitt