1. Pep Guardiola
Clubs managed: Barcelona, Bayern Munich
Pep Guardiola was frequently identified as a potential successor to Sir Alex Ferguson, but became the crusher of millions of dreams when it was revealed he would end his sabbatical to take over at Bayern Munich.
During his tenure, Bayern have won 12 and drawn two of their opening 14 fixtures in the Bundesliga, and Manchester United fans will wonder what might have been had he arrived at Old Trafford rather than the Allianz Arena.
Despite the fine work Guardiola is doing in Munich, he remains the clear favourite with bookies to become the next permanent manager of Manchester United.