Carlton Palmer was admitted to hospital on Sunday after suffering a "small heart attack" while running the Sheffield half-marathon.
The 57-year-old was running for a number of charities at the event in South Yorkshire but complained that his "heart played up" in the first mile of the 13-mile course. Palmer managed to complete the rest of the run alongside his wife, Lucy Kirkby-Palmer, who managed to finish in under two hours.
However, Palmer went to hospital after the race where he underwent tests and observations. The ex-Leeds and Sheffield Wednesday midfielder was kept in overnight and decided to update fans on his Twitter account at 3am.
He tweeted: "Just to let everyone know I am ok, being kept in overnight in hospital observation/tests heart played up again in the first mile but I managed to complete the course. Congratulations to my gorgeous wife for going sub two hours love you."
He later updated fans by revealing he had a "suspected small heart attack". He added: "Thank you so much for all the lovely messages I have being kept in hospital with a suspected small heart attack, they want to find out what has caused this problem so tests are ongoing. I will keep you updated. Gutted I was flying to Portugal at 4pm with Lucy."
As well as the message, Palmer also posted a photo of his Polar running account, which displayed a series of statistics from his session. It stated that he had completed the course in two hours and nine minutes.
Chris Kamara commented on his post with a message of support. He said: "I’m not the best person to talk to about ignoring stuff Carlton but carrying on running a 10k with heart palpitations. Are you sure! But glad you are ok."
This isn't the first time Palmer has had issues with his heart, however. Back in December 2016, he had to undergo a life-saving five-hour operation for a heart condition.
Palmer was 20 minutes into playing in a Masters Football game between England and Germany in Singapore. He had been told not to play by his wife and doctor after recent health scares, but did. Soon after kicking off, he knew something was wrong.
Speaking in 2017, Palmer told the Daily Mail: "I was fighting for my life. I could feel the air leaving my body. My heart was pounding like it was trying to get out of my chest and it was getting worse.
"I'd always been quite flippant about death. When it comes, it comes, that was my attitude but now I was thinking, 'f*** me', and all the things I should have done were flashing through my mind.
"Someone was shouting, 'He's going to arrest,' and someone else was shouting 'Quickly' and I was lying on the trolley with my arms and legs over the sides and I thought it was a stupid way to die."
Palmer started off his professional career at West Brom, before signing for Sheffield Wednesday, where he came a cult hero and a real fans' favourite. The former midfielder played more than 200 league matches in an Owls shirt before he later went on to join Leeds.
He also appeared for the likes of Southampton, Nottingham Forest, Coventry and Stockport, before announcing his retirement in 2005. He also earned 18 caps for England, featuring in the 1992 European Championships.
Having endured that heart scare six years ago, Palmer returned to England to manage Grantham Town at the start of last season. At the start of that campaign, Palmer, who was 55 at the time, named himself as a substitute against Ashton due to injuries in his squad. He was dismissed from his role after eight months.
