Four Falcons start for Argentina against Spain
Summer signing Eduardo Bello packs down at tight-head prop, with Pedro Rubiolo starting in the second row.
Matias Moroni is at outside centre, with fellow Falcon Mateo Carreras on the wing.
The match in Madrid kicks off at 7.45pm UK time and unfortunately is not available to watch or stream in the UK.
Los Pumas open their World Cup account against England (Sat Sep 9) before facing Samoa (Fri Sep 22), Chile (Sat Sep 30) and Japan (Sun Oct 8).