London Welsh have signed Pumas centre Gonzalo Tiesi from Argentine club San Isidro.
Tiesi, 27, has played in the Aviva Premiership before with London Irish and Harlequins and joins Welsh after being recalled to the Argentina side for last year's autumn internationals.
He immediately justified that recall by helping the Pumas to a fine victory over Wales at the Millennium Stadium.
He made his Argentina debut in 2004 against South Africa and played in the 2007 and 2011 World Cups.
Tiesi joined London Irish in 2004 from San Isidro before moving to Harlequins in 2008.
He moved on to Stade Francais in 2011 before returning to San Isidro.
London Welsh head coach Lyn Jones said: "The signing of Gonzalo Tiesi is a very significant one by the club. He's a proven and very experienced Premiership player who has had positive spells at London Irish and Harlequins in the past.
"He's also a player of true international quality and he proved himself again over the autumn period with Argentina.
"We look forward to Gonzalo adding a great deal to the playing and training environment at London Welsh."