Luton captain Tom Lockyer is awaiting test results “before the next steps for his recovery are determined”, his club said on Sunday.
Lockyer suffered a cardiac arrest on the pitch against Bournemouth on Saturday.
That match was abandoned and Luton confirmed on Saturday evening that Lockyer was “stable” in hospital.
On Sunday, Luton said: “While our captain Tom Lockyer remains in hospital following the cardiac arrest he suffered on the pitch at Bournemouth yesterday, we understand that supporters are concerned for him and that there is widespread media interest in his condition.
“Tom is still undergoing tests and scans, and is awaiting the results before the next steps for his recovery are determined.
“We are unable to provide a running commentary on his situation, and request that all media please wait for any updates to be released via the club’s official channels when the time is right.
“We all want the very best for Tom, his partner Taylor and the whole Lockyer family, and politely ask that his and their privacy is respected at this difficult time.”
Lockyer collapsed during the Championship Play-Off Final win against Coventry in May before being taken to hospital.
He subsequently had heart surgery and was given the all-clear to return to playing in June.