Swansea striker Bafetimbi Gomis says he is "fine" after fainting during his side's 3-2 league defeat at Tottenham.
Gomis, who collapsed three times in 2009, appeared to fall down immediately after Spurs took a sixth-minute lead.
The Frenchman, 29, received treatment before leaving the pitch on a stretcher and was later taken to hospital.
Gomis tweeted: "I have been under a great deal of stress and fatigue due to my father's health that requires me to go back and forth to France."
He added: "I wanted to reassure you concerning my health. It actually looks much more scary than physically dangerous. I am feeling well now."
Gomis, who joined Swansea from Lyon last summer, had a series of medical tests in 2009 after three episodes of fainting while a Lyon player. They indicated no serious threat to his health.
Swansea manager Garry Monk told BBC Radio 5 live: "We understand his history. He has had all the tests but it's just part of his life, it's what he's been through growing up."
A Swansea spokesman said they were aware of the vasovagal condition (a form of low blood pressure) and "had all the medical and cardiology tests with us."
Players from both sides looked concerned as Gomis was treated but he left the pitch conscious and speaking.
Later on Wednesday, Gomis said on social media: "I was disappointed that I couldn't help my team tonight but now everything is back in order."
Tottenham's ground was the venue where Fabrice Muamba, now 26, suffered a cardiac arrest playing for Bolton against Spurs in an FA Cup quarter-final in 2012.
Muamba recovered but never played again.