The youngster was taken unwell during the Whites game against Middlesbrough and had to be stretchered off the bench, but his agent later tweeted that Clarke was fine after spending some time in hospital. The teenager was removed from the Leeds bench on a stretcher by paramedics, having had oxygen administered, and taken to hospital, from where he has since been released.
"What we know is that he didn't feel well", Leeds manager Marcelo Bielsa said.
Spurs were strongly linked throughout the January transfer window while Arsenal have emerged as serious contenders for Clarke's signature during more recent times but it looks as though the north Londoners will face further competition.More news: Christian Hackenberg Forgets He’s Mic’d Up During Game
"Jack has had messages from football fans from every club you can imagine and we all really appreciate it", he wrote.
"In the meantime we would like to thank everyone who has sent well wishes and once again thank Middlesbrough Football Club for all they did for Jack".
The rumours have it that if Leeds can secure promotion to the Premier League next season then they might make a move for James Milner and Liverpool are willing to offload the midfielder in return for Clarke.More news: Klobuchar taking campaign to Midwest states that Trump won
And a fellow twitter user said: "Hope Jack Clarke is ok!"
Clarke has been valued at around £12m despite only making his debut earlier this season.
The highly rated winger has been gaining interest from a host of Premier League clubs, with suitors including top teams such as Tottenham Hotspur, Manchester City and Manchester United.More news: England World Cup-winning goalkeeper Banks dies
Leeds take on Swansea on Wednesday.