Utility back Jordan Larmour is facing an extended spell on the sidelines after dislocating his shoulder in Leinster's 37-25 win over Benetton last Saturday.
The injury could keep the St Andrew's alumnus out for up to 16 weeks which means he is sure to miss the conclusion of the Six Nations and possibly the Nations Cup as well.
Larmour was replaced early in the second half and required pain relief oxygen as he left the field.
"Jordan has taken a pretty heavy bang to his shoulder so we’ll get him assessed," Leinster head coach Leo Cullen explained after the game.
"You could see he was in a fair degree of discomfort and stayed down for a while.
"We will get him scanned when we get back and we'll see the extent of that then."
Cullen gave an update on the winger's condition on Monday, revealing that the winger will be out for up to 16 weeks after undergoing a procedure on the injury last week.
Larmour's absence will be more unwelcome news for Ireland coach Andy Farrell as he looks ahead to a busy autumn period with Keith Earls already ruled out due to a back injury.
Leinster victory in Treviso sees the reigning champions top Conference A with a perfect ten points out of a possible ten after two games. Ulster are a point behind after their 24-14 victory over Ospreys at the Liberty Stadium.
Munster are second in Conference B on eight points after more late drama saw them edge out Edinburgh in a thriller at Thomond Park.
Cardiff Blues, who travel to Limerick in the next round, are top on nine points after two games.
The PRO14 is set to return in two weeks time with SIX LIVE games on eir sport including Leinster v Zebre on Friday, October 23rd (LIVE on eir sport 1 from 7.15pm), Ulster v Dragons and Edinburgh v Connacht on Sunday (BOTH games LIVE on eir sport 1 from 2.55pm and 7.30pm respectively) followed on Monday, October 26th by Munster v Cardiff Blues (LIVE on eir sport 1 from 7.45pm).
***See EVERY PRO14 game this season ONLY on eir sport.