Ireland and Ulster prop, Declan Fitzpatrick, remained in a Glasgow hospital on Sunday night after he was forced out of a RaboDirect PRO12 match having suffered heart palpitations.
The 30-year-old was a first half replacement during Ulster’s league game against Glasgow Warriors at Scotstoun on Friday night.
But he was forced to retire 22 minutes later with the heart irregularities.
Fitzpatrick was taken to hospital and while Ulster Rugby said last night his heartbeat was normal he was being detained for further tests to be carried out.
It raises questions about the player’s future professional career.
He still has two years to run on his current contract with Ulster, but former props Clem Boyd and Simon Best, were forced into early retirement due to heart related problems.
Fitzpatrick has had an injury blighted career and his return to the Ulster bench on Friday night came after a three-month layoff after he suffered concussion playing with his club in the Heineken Cup pool stages.
Ten years ago this summer, Fitzpatrick was emerging as a promising tighthead prop and was a member of the Ireland Under-21 squad which lost in the final of the Junior World Cup against New Zealand in Glasgow.
He went on to win seven senior caps with Ireland.