Damien Varley, Stephen Archer and Danny Barnes have all agreed terms that will keep them with Munster until the end of the 2012/2013 season.
Archer, Munster’s 23-year-old tighthead prop, and 21-year-old-wing Barnes have both come through the Munster academy and development systems.
Varley returned to Munster at the start of last season after a spell with London Wasps.
Commenting on the news, Munster head coach Tony McGahan said: ‘It is extremely satisfying to see players come up through the Munster system, whether it is from the schools program for Stephen or the youth program for Danny.
‘For these two players to continue through the academy system and now graduate to the senior programme, having accumulated Magners League time before reaching a professional contract, gives a clear indication of the hard work done by the academy programme.
‘Damien’s signing of a new contract reflects his hard work and single-minded approach he has displayed since his return to Munster.
‘His form for us has been rewarded with an international cap and we feel his continued progress will play a significant role in both Munster’s and Ireland's rugby programmes.’
Since returning to his native province, Garryowen clubman Varley has won 44 caps, and this term has played in 21 of Munster's 24 games to date.