You will need to be part of the squad or part of the development process through their academy
Leinster
Leinster Rugby was created in 1875.
Leinster Rugby was founded in 1875 in Ireland and formed from four Irish Rugby teams. Leinster Rugby is responsible for Rugby Union throughout the Irish province of Leinster.
... Joe Schmidt: Head Coach
The only place to get that signed is to contact the Marketing manager at the club and/or go there on match days and ask for autographs
Either ebay or contact Leinster marketing team direct and they may have stock still on shelves. However, this is rare to hold old stock
Before Brian O'Driscoll, the captain of the Leinster rugby team was Chris Whitaker. He served as captain during the early 2000s, leading the team through a formative period before O'Driscoll took over the captaincy in 2003. Whitaker was known for his leadership and experience, contributing significantly to Leinster's development.
Because there is no Northern Irish team. The Ireland rugby team represents north and south, At European level there are 4 Irish teams: Ulster (which is the 6 counties of northern Ireland +3 other), Leinster, Connaught and Munster.
In Rugby, Ireland would be the better team. Ulster has some good players, but their best are brought together with the best of players from the other three provinces, Munster, Connacht and Leinster, to form a national team.
Brian O'Driscoll would be Leinster's best player. He is also regarded as Ireland's best player and one of the best in the world.
the main character gets picked for the Welsh national rugby team.
Leinster v Munster at Croke Park - 82,208 is a new world record attendance for a club rugby game