Here's a few of the most passionate:
Lord Richard Attenborough
'I went and stood on a bank with a packet of sandwiches with my girlfriend who I eventually married, principally because she agreed to follow Chelsea, and we've been going since 1942'.
'I lived near Highbury, and the year Arsenal won the Double in 1971, me and my dad went to every League match and every FA Cup match, apart from the FA Cup final. We only had one ticket for that, so my dad went. Funny thing was that I was really a Chelsea fan. I still support Chelsea'.
Lord Coe and Steve Redgrave
Coe: 'I watched the (Champions League Final) game in Munich sitting alongside two of my kids and Sir Steve Redgrave. We are both diehard Chelsea fans, and as Didier Drogba put the ball on the penalty spot for the final kick of the game I think we would both have swapped all our Olympic gold medals to see the ball hit the back of the net'.
'A' Chelsea (fan), going back to the 1967 FA Cup final. I was watching it with my father. It was one of the days where you could get the reception so you could actually see what was on telly. Chelsea were playing Spurs and during the match I just decided I was up for Chelsea. They lost. What can I say ? It's like a congenital disorder - you can never get rid of it. I've been a Chelsea fan ever since'.
'It's not just about having a sense of kinship with, for me, other Chelsea supporters, but about being able to do what men have traditionally always done - find common ground and have an agreeable and warm chat about sport'.
'When I was a little kid I just told him (my dad) I was a Chelsea supporter and he bought me the kit'.
'I moved around a lot when I was a kid. I lived in Fulham for a while, hence the fact that I'm a Chelsea fan'.
'Listen, I am a Chelsea fan before the Russians come'.
image: © Tom Cuppens