Niall Quinn is to step down as Sunderland’s director of international development.

The 45-year-old former chairman and manager of the north east club says he will be returning to Ireland to concentrate on his family and business interests outside football.

“I’ve had the most amazing six years and it gives me a huge sense of pride to see where Sunderland is today,” Quinn said in a statement on the Sunderland website on Monday.

“Sunderland is in an incredibly fortunate position to have a hugely talented team of people leading the football club. Everything is in place for Sunderland to really make a statement, which was always my aim.

Quinn said hiring Martin O’Neill as the club’s manager in December was one of the highlights of his time and O’Neill said Quinn was a hero for the club.

“Niall has been a truly iconic figure at Sunderland, both as a player and in his time leading the club from the top,” he said.

“His vision and drive, alongside that of Ellis, played a significant part in me coming here.

“Like everyone, I couldn’t be more disappointed that he has decided to step down but, of course, I respect and understand his decision.

“He has been the heartbeat of the football club for so long and his legacy is immeasurable. To me he is ‘Mr Sunderland’ – and always will be.”

Sunderland are ninth in the Premier League.