Ireland will have to do without James Ryan and Ryan Baird in their crunch Six Nations showdown with Scotland on Saturday.
Ryan was unable to return to the field after he was floored by a dangerous tackle from Charlie Ewels only 82 seconds into Ireland’s 32-15 win over England at Twickenham last weekend.
Ewels was shown a red card for clashing heads with Ryan, who failed a subsequent head injury assessment.
Lock Ryan will not be available when Andy Farrell’s side do battle with Scotland at the Aviva Stadium on the final day of the tournament.
Fellow second row Baird also missed the encounter in Dublin due to a back injury, so Ross Molony and Joe McCarthy have been called up to train with the squad.
Second-placed Ireland are two points adrift of leaders France and must win to keep their hopes of winning the title alive, with Les Bleus facing England in Paris later in the day.