Jones, 31, has played nearly 200 games for Sale Sharks since making his debut in the 2005-06 season.
The Sharks stalwart, and cornerstone of their pack for nearly a decade, made a move to then Championship side Bristol for the 2015-16 season before returning to the North West for the 2017-18 season.
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Pontypridd born Jones moved north to pursue his rugby dream opting to settle in the Salford area with his young family.
Jones’ acquisition is an exciting one for the Scarlets with the highly experienced player likely to challenge both Ken Owens and Ryan Elias as well as help the development of young hookers Taylor Davies and Dafydd Hughes.
Scarlets Head Coach Wayne Pivac said; “We’re extremely pleased to be in a position to officially confirm Marc’s signing.
“We have two international hookers in Ken and Ryan and two very exciting prospects in Taylor and Daf. Marc is a very experienced player who will challenge our international hookers in Ken and Ryan but will also be an important asset to us during the international windows.”
Marc Jones added; “This opportunity to join the Scarlets is one that I’m particularly excited by and can’t wait to get started this week. I was born and bred in Wales and have always harboured ambitions of playing my rugby at home.
“I’m extremely proud to have represented Sale Sharks for the best part of a decade but this new opportunity is one that I’m looking forward to and we’re excited by as a family.
“The Scarlets have led the way in recent seasons and I’m looking forward to playing part in the seasons to come.”
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