Munster and the IRFU have confirmed that Ronan O'Mahony and Duncan Williams have signed two-year contract extensions with the province.
Alongside the contract news, Leinster academy player and back-row forward Jordan Coghlan will be moving to Munster on a development contract.
Scrum-half Williams has secured a two-year extension, which will see him remain until June 2017 while O'Mahony moves into full contract terms.
Williams, the most capped scrum-half in the current squad, made his league debut against Connacht in December 2009 in Thomond Park and has made 83 appearances for the province. The academy graduate moved on to a full contract at the start of 2010/11 and has impressed since.
"Looking ahead it is great to have Ronan and Duncan on board again as we continue to build our squad for next season, and in signing Jordan we look forward to seeing him develop and contribute to the squad," head coach Anthony Foley told Munster Rugby.