Leinster have added academy scrum-half Paddy Patterson to their European squad after Luke McGrath was ruled out for 6-8 weeks with a knee injury.
McGrath, who is set to miss the Six Nations, went down late on against Toulouse last Saturday, with Leinster winning with a bonus point to reclaim control of their Champions Cup pool.
Jamison Gibson-Park will start for Leinster against Wasps in Coventry this weekend, with Patterson added as cover. The 20-year-old former Blackrock College pupil has made one senior appearance for Leinster, coming off the bench in a bright cameo against the Dragons in December.
Patterson comes into Leinster's European squad in place of Nick McCarthy, who is currently sidelined with a wrist injury. McCarthy is set to join Munster in the summer, with Patterson and Hugh O'Sullivan the two scrum-halves behind the first choice duo of McGrath and Gibson-Park.