Munster forward Peter O'Mahony has signed a new contract with the IRFU that will keep with the province until the summer of 2015.
The Cork native made his Munster debut in 2010 and has recorded 43 appearances, captaining the side at the beginning of last season.
O'Mahony won his first full international cap in Ireland's win over Italy in last year's Six Nations and he has gone on to win a further eight caps for his country.
"I am delighted to have my future sorted and to commit to Munster," said the 23-year-old.
"It has been a really enjoyable journey so far for me in my career and the last two seasons in particular have been exciting, from breaking into the Munster team and captaining the side and then earning my first cap for Ireland.
"I'm thoroughly enjoying my rugby at the moment and feel there is much more that we can achieve with Munster and Ireland over the next couple of years and I wanted very much to be a part of that."
IRFU chief executive Philip Browne said: "Peter O'Mahony is one of the new generation of players that are continuing to emerge from the development pathways in Irish rugby.
"At this point in a young player's career, it is so important for both Munster and Irish rugby to be able to continue to have a positive input into that development.
"The policy for Irish rugby will be to continue to strive to keep all of our top players here in Ireland playing for our provincial teams."
Munster head coach Rob Penney added: "We are delighted that Peter has agreed terms with the IRFU that keeps him here in Munster for the next two seasons. He represents the new breed of player, the next generation if you like, that are so critical to Irish rugby.
"To have him committing to the Munster organisation is a huge validation of what we are trying to achieve here. It is a particularly encouraging that a young man of such ability and talent has the belief that his ambition is best served by the structures that we have in place here.
"So, in that regard, this news is massive. It's great for Munster and for Ireland too."