Contepomi is joined by the likes of fellow seasoned campaigners Rodrigo Roncero, Mario Ledesma and Juan Fernandez Lobbe as the Pumas prepare for a World Cup pool in New Zealand that also includes England and Scotland.
Argentina coach Santiago Phelan has already named his 30-man squad for the tournament, and Saturday's side for the match at the Millennium Stadium is thought to be the one he hopes to field against England in Dunedin on September 10.
The Pumas will conclude their preparations by facing Aviva Premiership club Worcester next week.
Wales: L Byrne (Clermont Auvergne), L Halfpenny (Cardiff Blues), J Davies (Scarlets), J Roberts (Cardiff Blues), G North (Scarlets); J Hook (Perpignan), T Knoyle (Scarlets); P James (Ospreys), R Hibbard (Ospreys), A Jones (Ospreys), B Davies (Cardiff Blues), A-W Jones (Ospreys), D Lydiate (Newport Gwent Dragons), M Williams (Cardiff Blues), R Jones (Ospreys, captain)
Replacements: H Bennett (Ospreys), R Bevington (Ospreys), A Powell (Sale Sharks), J Tipuric (Ospreys), L Williams (Cardiff Blues), S Jones (Scarlets), A Brew (Newport Gwent Dragons).
Argentina: M Rodriguez; H Agulla, M Bosch, S Fernandez, G Camacho; F Contepomi (capt), N Vergallo; R Roncero, M Ledesma, J Figallo, M Carizza, P Albacete, J-F Cabello, J-M Leguizamon, J Fernandez Lobbe.
Replacements: A Creevy, M Scelzo, M Galarza, A Campos, A Lalanne, N Sanchez, J Imhoff.
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