Leeds United's teenage winger Jack Clarke remains "under observation" after falling unwell on Saturday, says boss Marcelo Bielsa.
There was a lengthy delay after the 18-year-old, who was substituted at half-time, was taken ill in the dugout and then stretchered off while given oxygen.
The Championship game was stopped for seven minutes due to the incident and it has been confirmed that Clarke was taken to hospital for further assessment.
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!"
"But when he was taken to the dressing room he was better".
Fans have been wishing Clarke the best.
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"The important thing is that fingers crossed, the boy is okay and he recovers because he's a very talented young player", he said.
Clarke was taken to hospital and then spent Saturday night in the care of Leeds' medical staff. "All our thoughts go to the lad Clarke".
In 16 league appearances Clarke has scored two goals and has two assists, but has clearly done enough in that time to appear on Liverpool's transfer radar.
The 18-year-old is a product of the Leeds' academy and has been making the right waves in the English second division, in what is his debut campaign.
Marcelo Bielsa's side are now second in the table, trailing Norwich City by two points.
Sheffield United lie in third position - three points off Leeds - after missing a golden opportunity of going top themselves surrendering a 3-0 lead on Friday to be held 3-3 by Aston Villa.