Sam Allardyce faces former club Newcastle this weekend.
Allardyce, 61, was appointed Sunderland manager earlier this month following the departure of Dick Advocaat from the Stadium of Light, and opened with a 1-0 defeat away at West Bromwich Albion last weekend.
This weekend, Sunderland play their biggest game of the season, as they host North East rivals Newcastle in the Tyne-Wear derby - a game which Sunderland have been hugely successful in over recent years.
'Big Sam' managed Newcastle for just over six months between May 2007 and January 2008, with a torrid spell at St. James' Park damaging his reputation at the time.
Ahead of facing the Magpies, Allardyce as told The Sun what his biggest problem was during his time on Tyneside - and admitted that the arrival of Mike Ashley was a contributing factor in his departure.
"It just didn’t happen for me — but I enjoyed what I built in a short period of time there," said Allardyce. "The biggest problem was simply that a new owner (Mike Ashley) came in and he decided I wasn’t the manager he wanted. He didn’t choose me, he inherited me. It was a straightforward parting of ways, swiftly done and dusted. So I’ve got no problem with Mike," he added.
Allardyce may insist that he has no ill feelings towards Newcastle, but he will still be desperate to win the game on Sunday, not just because Sunderland need a win, but also to get some revenge over his former club.