Star Metro - Lock Petti to become latest Argentina centurion in Nations Championship Test 

Petti, 31, follows in the footsteps of second-row partner Matias Alemanno, who reached the landmark in last week's campaign-opening loss to Scotland in Cordoba, having made his Test debut in 2014.

Head coach Felipe Contepomi has made five changes for Saturday's game with props Boris Wenger and Tomas Rapetti coming in among the front-row.

Mayco Vivas drops to the bench but Pedro Delgado is out of the matchday squad.

Back-rower Marcos Kremer replaces co-captain Pablo Matera at openside flanker while centre Justo Piccardo and winger Bautista Delguy take the places of Faustino Sanchez Valarolo and Rodrigo Isgro.

Wales head coach Steve Tandy has named Louis Rees-Zammitt on the bench with Ellis Mee taking the speedster's place in the starting lineup.

Tandy has made two other alterations from last weekend's win over Fiji as Sam Costelow is handed the No 10 shirt with Dan Edwards out of the 23 completely and James Botham replacing Alex Mann at blindside flanker.

Former England under-20s back-rower Kane James could make his Test debut, having been selected on the bench.

Argentina (15-1)

Santiago Carreras; Bautista Delguy, Lucio Cinti, Justo Piccardo, Mateo Carreras; Tomas Albornoz, Gonzalo Garcia; Joaquin Oviedo, Marcos Kremer, Santiago Grondona; Matias Alemanno, Guido Petti; Tomas Rapetti, Julian Montoya (capt), Boris Wenger

Replacements: Ignacio Ruiz, Mayco Vivas, Francisco Coria Marchetti, Franco Molina, Pablo Matera, Simon Benitez Cruz, Matias Moroni, Ignacio Mendy

Coach: Felipe Contepomi (ARG)

Wales (15-1)

Blair Murray; Ellis Mee, Eddie James, Joe Hawkins, Josh Adams; Sam Costelow, Tomos Williams; Aaron Wainwright, Jac Morgan, James Botham; Adam Beard, Ben Carter; Dillon Lewis, Dewi Lake (capt), Rhys Carre

Replacements: Ryan Elias, Nicky Smith, Ben Warren, Teddy Williams, Kane James, Kieran Hardy, Max Llewellyn, Louis Rees-Zammitt

Coach: Steve Tandy (WAL)

Referee: Paul Williams (NZL)

K.Evans--SMC