Ulster have confirmed that Rob Herring and Nathan Doak are injury doubts for Friday’s Challenge Cup quarter-final against La Rochelle (20:00 BST).
Herring (calf) and Doak (ankle) both picked up injuries in Saturday’s 28-24 victory over Ospreys at the Affidea Stadium.
Scrum-half Doak made his international debut in the Six Nations and has been influential in Ulster’s impressive form this season.
Stewart Moore (knee), Rory McGuire (shoulder), James McNabney (knee), Michael Lowry (groin) and Robert Baloucoune (elbow) will remain sidelined this weekend.
Richie Murphy’s side face La Rochelle for a spot in the Challenge Cup semi-finals with the northern province unbeaten in their past two games.
This weekend’s visitors defeated Newcastle Red Bulls 26-18 to reach the last eight and have won three of their past four fixtures.
Montpellier host Connacht, Benetton welcome Exeter Chiefs and Zebre face Dragons in the other quarter-finals.
