Leinster are looking at a scrum-half crisis ahead of their Heineken Cup match against Gloucester at Lansdowne Road on Saturday evening.
Guy Easterby has been ruled out with a broken jaw. Chris Whitaker has been described as "very doubtful" by coach Leinster coach Michael Cheika.
It could leave the rookies Cillian Willis and Matt D'Arcy to dual it out for their first senior starts for the province with Willis seen as the favourite.