Ryan is the more NFL-accomplished of the duo, having guided the Jets to consecutive AFC championships in his first two seasons as head coach.

WSJ: Jason Gay: 'Magic Khakis' Rex Ryan vs. 'Football Bieber' Tim Tebow

During his time at Famagusta, Ketsbaia has guided the club to two league titles, one Cypriot cup and the Cypriot Super Cup.

BBC: Temuri Ketsbaia

In his 608 games in charge at Boundary Park, Royle guided Athletic to two FA Cup semi-finals, a League Cup final and the top flight for the first time in 68 years.

BBC: Manager Royle set to leave Oldham