You might be forgiven for thinking that Jose Mourinho is Chelsea's most successful manager, but you'd be wrong.
It turns out Avram Grant is the club's most successful manager of the Premier League era - if you measure his achievements purely on points rather than trophies.
The former Blues boss won 74 Premier League points out of a possible 96 while in charge at Stamford Bridge.
That's 77 per cent of total points available - more than any other Chelsea manager to have taken charge for at least 10 matches..
Okay, it's perhaps not as significant as winning the Champions League, the Premier League, the FA Cup, or even the League Cup, but it's still a decent achievement on Grant's part.
Chelsea's most successful managers based on percentage of points won
Carlo Ancelotti comes third with 69% of points won followed jointly by Rafa Benitez and Felipe Scolari with 65% of points won.
Bottom of the pile though is former England boss Glenn Hoddle.
In his previous life as the Blues' boss he won 42% of the Premier League points available to his side.
Ian Porterfield won 43% of points, David Webb won 49%, Ruud Gullit won 55% and Andre Villas-Boas won 57% of points.