Tommy Reffell will make his senior international debut for Wales in their Test series opener against the Springboks in South Africa on Saturday.
The Leicester Tigers back-rower has been named to start at openside flanker in Pretoria.
Reffell is the lone debutant in the Welsh matchday squad and will come up against fellow Tigers back-rower Jasper Wiese, who has been named to start at No.8 for the 'Boks for their first Test of 2022.
Julián Montoya will lead Argentina in their first Test of the 2022 Summer Series against Scotland in San Salvador on Saturday, July 2.
Montoya starts at hooker and is joined in the Los Pumas matchday squad by Tigers team-mate Matías Moroni for the first of the three Test series.
With six members of the Tigers squad included in the England side for their Test series opener against Australia, as well as three Senior Academy squad members featuring for England Under-20s, more than a dozen players from the club are in action during the international window.