Munster and the IRFU have confirmed that Dave O’Callaghan, Brian Scott and Ciaran Parker have signed contract extensions, while Robin Copeland will depart the province at the end of the season.
O’Callaghan, who recently returned from a long-term knee injury, has signed a one-year contract extension that will see him remain with the province until at least June 2019.
The 28-year-old, a former Academy Player of the Year, has made 78 appearances for the province and plays across the back row and second row.
Scott has penned a two-year contract to begin from the start of the 2018-19 season. The 24-year-old has played on 19 occasions and scored his first try on his first start against Zebre at Thomond Park last month.
Tighthead prop Parker has made two appearances since making the move from Sale Sharks at the start of the season and has signed for another campaign.
Copeland will finish with the province at the end of this season.
The 31-year-old back row has made 62 appearances, scoring 11 tries, since his debut against Treviso in September 2014.
He was man-of-the-match in the win against the Maori All Blacks in November 2016.
The Wexford native made his senior debut against Georgia.
Head coach Johann van Graan said: "While it has been great to retain so many of our players this season, we respect Robin’s decision to move on.
"A physical and versatile player, we know he will continue to be successful, and everyone at Munster wishes Robin all the best for the future."