Hot seat casualties
The former midfield general was manager at Liverpool when he suffered a heart attack and was forced to undergo triple bypass surgery in 1992, but returned just days before leading his side out at Wembley as they beat Sunderland to claim the FA Cup. He continued to manage until 2006.
The then West Ham manager required brain surgery to remove a small tumour in April 2003. The Londoner suffered a minor stroke when collapsing after his side's clash with Middlesbrough at Upton Park and at one point he was on a life- support machine. Roeder returned to the helm for pre-season training, but was sacked in August.
The phrase 'dying with his boots on' was coined for Stein, who collapsed and died after his Scotland side scored against Wales in a crucial World Cup qualifier at Ninian Park, Cardiff on September 10, 1985. The legendary former Celtic manager died on the physiotherapy table in the away dressing-room.
Former Irish international Kinnear has had to give up management twice due to his heart problems, leaving Wimbledon initially after suffering a heart attack before a Premier League game against Sheffield Wednesday in 1999. Ten years later, as he enjoyed an unlikely second chance at Newcastle United, the then 63- year-old fell ill, and eventually required a bypass. He was replaced by his assistant Chris Hughton.
Houllier experienced heart pains just after delivering his half- time team talk during Liverpool's 1-1 draw with Leeds United in October 2001. The Frenchman was rushed to hospital and was transferred to a cardiothoracic unit. The current Aston Villa manager underwent 11 hours of emergency open-heart surgery, but recovered to take charge of Liverpool before the end of the season.
The recently deposed Blackburn Rovers manager had to put away
his headset for a while after being diagnosed with heart problems during a routine GP check-up. Allardyce underwent surgery on a coronary artery back in December 2009, before returning to work having missed four matches.