Prop Phil John and hooker Emyr Phillips are to stay at the Scarlets, but they have lost centre Rhodri Gomer-Davies to injury.
John, 31, made his Llanelli RFC debut in 1999 and has signed a two-year extension to keep him at Parc y Scarlets until the end of the 2014-15 season.
Phillips, 25, has secured a fresh three-year deal, taking him to 2016.
Gomer-Davies, 30, has been unable to overcome a knee injury.
Gomer-Davies said: "It's a tough reality to face up to, shown once again by the sad news of Morgan Stoddart having to retire in his prime recently and seeing the support he got at Parc y Scarlets last weekend from the home crowd.
"It's just having the positive mindset to move on but it does take some time to sink in and during that adjustment it's good to still be involved in some way and be close to the game."
Gomer-Davies' professional career began at Northampton in 2003.
He joined Newport Gwent Dragons in 2007 and moved to Parc y Scarlets in 2011 as part of a joint deal with Wales Sevens.
He has also become in Welsh language television rugby commentary work for S4C recently and is studying as a Welsh/English translator at Aberystwyth University.
Hooker Phillips' continued career at the Scarlets was announced soon after Wales and British and Irish Lion