Ballynahinch's Zack McCall is the only Ulster player in Colin McEntee's 12-man squad for this weekend's FIRA Under-19 invitational Sevens in Lisbon.
Leinster and Connacht also have just one representative, with six from Munster and three Exiles completing the group.
Ireland's Pool A co-runners include France, the top seeds, with Germany and Denmark the others. Ireland open with a match against the Germans followed by a meeting with the Danes before taking on the favourites.
The team coach is former Dungannon, Ulster and Irish international scrum-half Kieran Campbell.
Ireland FIRA U19 Sevens European Championships squad: Zack McCall (Ulster), Sean O'Hagan (Connacht), Harrison Brewer (Leinster), Steven McMahon, Greg O'Shea, Tomas Quinlan, Jack Cullen, Ben Kilkenny and Sean McNulty (all Munster), Bradley Greet, Callum Sheedy and Matthew Killeen (all Exiles).
* Willie Ruane is Connacht Rugby's new Chief Executive Officer.
The IRFU-appointed newcomer has a strong link with the western province; he played for Connacht in the late 1990s and also represented Ireland at Colleges and Under-21 levels.
The in-coming CEO said: "I have a strong connection with Connacht Rugby and a good understanding of the challenges.
"Connacht have a top-class coach, an exciting squad of players and some fantastic facilities. I am looking forward to helping to drive success on and off the pitch."