A review into medical protocol is expected at Luton after captain Tom Lockyer collapsed on the pitch for the second time in seven months.
Lockyer, who suffered a heart issue during the Championship play-off final in May, was given the all-clear to return to football in June.
But Mail Sport understands that decision will now be reviewed once medical experts have further information on the cause of Saturday's incident at the Vitality Stadium in Luton's match against Bournemouth.
Lockyer, who has featured in 15 of his team's 16 Premier League games this season, suffered a cardiac arrest in the 59th minute and, after a delay of around 10 minutes, the 29-year-old was said to be 'alert' and 'responsive' as he was carried off on a stretcher and taken to hospital.