Leeds winger Jack Clarke left hospital on Saturday night after being taken ill during his side's 1-1 Sky Bet Championship draw at Middlesbrough.
Clarke, who had been substituted at half-time, complained of feeling unwell in the dugout and was then carried away on a stretcher while being given oxygen.
Former Leeds defender Ian Harte, who represents Clarke, revealed the 18-year-old had been discharged from The James Cook University Hospital and thanked the medical teams from both sides.
He said on his official Twitter page: "Big thanks to the Middlesbrough medical team and a special mention to Leeds United's Rob Price (head of medicine and performance) for today!
"Jack has left the hospital now happy and smiling. Hopefully back on the pitch very soon.
"And also a big thanks to everyone involved with James Cook hospital the staff have been brilliant!!!"
Leeds went on to score a last-gasp equaliser in the 12th-minute of stoppage time to earn a point and return to the top of the Championship.
The club's chief executive Angus Kinnear was grateful for the support shown around the world for Clarke.
He said: "Jack has had messages from football fans from every club you can imagine and we all really appreciate it.
"He will undergo some more tests this week and everything is looking well, but he won't train for the rest of the week.
"In the meantime we would like to thank everyone who has sent well wishes and once again thank Middlesborough Football Club for all they did for Jack."
Leeds sit a point ahead of Norwich who face rivals Ipswich on Sunday, live on Sky Sports Main Event HD and Sky Sports Football HD.