Leinster wing Dave Kearney will miss the European Champions Cup semi-final clash with Clermont in Lyon on Saturday.
Kearney is expected to be ruled out for a couple of weeks but he will undergo a scan later in the week to ascertain the full extent of the damage.
He rolled his ankle in the 34-27 win over Connacht on Saturday only having just made his comeback from a toe injury two games previous.
In fact, the 27-year-old has only made seven starts in total since last May when he also damaged his ankle in what is becoming a career plagued by injury.
Meanwhile, Leinster coach Stuart Lancaster has bemoaned Kearney’s bad luck and admits it is unlikely he will take to the field again this season.
“I was gutted for him really because what people don’t see is the work he has put in to get fit again,” Lancaster told The Irish Times.
“The injury, the recovery, the rehab and the time on his own with the physios and strength and conditioning coaches.
“I personally was gutted for him because I haven’t really worked for him over the last 12 months. It’s going to keep him out for a few weeks now and it’s a real shame for him.
“He’s devastated really, he had put so much hard work in and he was fighting to get in that European squad and now he’s back on the physio bed. He’ll be back though, he’s still a young player and there’s a long way to go in his career.”