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Born in Rosario, Vallejos has represented Argentina in the U17, U18, U20 and U23 age groups as well as achieving his first cap for the Pumas after featuring at the 2011 Rugby World Cup.
Scarlets Head Coach Simon Easterby said: "We're delighted to announce formally that Tomás will be joining our squad for next season.He is a player we have followed closely throughout last season while he was at Harlequins and believe he can bring a new dimension to our second row options enhancing and strengthening our set piece play. We want to bring in players that are the right fit for us as well as complementing the players we have here already.
"He is an excellent line-out forward, an athletic player and exactly the type of player we see fitting well with the way we want to play at the Scarlets going forward and our ambitions for the future."
