Munster have tied Ireland international Dave Kilcoyne and Six Nations squad members Rory Scannell and Niall Scannell down to contract extensions on a bumper day of business.
Kilcoyne will remain with the province until June 2020, while the Scannell brothers, uncapped prior to their inclusion in Joe Schmidt's latest Ireland squad, have agreed deals running through to June 2019.
Munster have also handed contract extensions to Tyler Bleyendaal, Duncan Williams and Darren Sweetnam, keeping them aboard for the next two seasons.
The signings of Chris Farrell from Grenoble, James Hart from Racing 92 and JJ Hanrahan from Northampton Saints on two-year deals starting from the 2017-18 season were announced on a busy day for the club.
Director of rugby Rassie Erasmus said: "I've talked about maximising our potential time and time again. Retaining players such as Killer [Kilcoyne], Niall, Rory, Tyler, Duncan and Sweets [Sweetnam] is key to our long-term plans and they have all played an integral role in our success so far this season.
"Developing home-grown players is at the core of everything we do and it's rewarding to see five players who have advanced from the Munster pathway commit their future to the club."
On the new signings, Erasmus said: "I've always indicated our intention to recruit Irish qualified players where and when possible so to secure the young trio of Farrell, Hanrahan and Hart is great for the province and Irish rugby in general.
"In addition to being hugely talented they bring a wealth of knowledge with their combined experiences from playing abroad and this will help with our overall squad development."