Source: BBC SportFormer Sunderland manager Martin O'Neill says that he deserved to stay at the Stadium of Light until the end of the season after "saving the club" when it was "on its knees".
The Northern Irishman spoke for the first time about his sacking on 30 March to BBC Radio 5 live's Pat Murphy.
Ex-Swindon boss Paolo Di Canio was appointed within 24 hours of O'Neill's exit on a two-and-a-half-year contract.
"I'm still disappointed and frustrated but life goes on," said O'Neill.
Former Celtic and Aston Villa manager O'Neill took over the club he supported as a boy from current Hull City boss Steve Bruce in December 2011.