Rafael Carballo has been called into the Argentina squad © Getty Images

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Argentina coach Santiago Phelan has made three changes to his squad for their second Test against Scotland in Mar del Plata on Saturday.

Having slipped to a 24-16 defeat to Andy Robinson's tourists in Tucuman last weekend, former Test flanker Phelan has wasted no time in shuffling his deck as the Pumas look to halve the series.

Winger Rafael Carballo, Tucuman RC second-rower Santiago Guzman and Dax scrum-half Nicolas Vergallo join the squad as London Irish scrum-half Alfredo Lalanne, Montpellier prop Juan Figallo and Universitario La Plata lock Mariano Galarza drop out.

Phelan has warned his players they will have to improve dramatically before round two. The Pumas scored two tries to none in the first Test, but were undone by the boot of Scottish fly-half Dan Parks.

"We have many aspects of the game to improve, such as discipline and the number of penalties we gave away," he said. "However, we had some good movements in the first half, we took the initiative and scored two tries. Anyway, we failed to keep possession and we were tired from defending too much."

Argentina squad: Backs: Horacio Agulla (Leicester), Lucas Borges (Albi), Rafael Carballo (Beagles Bordeaux), Felipe Contepomi (Toulon), Santiago Fernandez (Montpellier), Agustin Figuerola (CASI), Lucas Gonzalez-Amorosino (Leicester), Ignacio Mieres (Stade Francais), Martin Rodriguez (Stade Francais), Gonzalo Tiesi (Stade Francais)

Forwards: Patricio Albacete (Stade Toulousian), Marcos Ayerza (Leicester), Alejandro Campos (Montauban), Manuel Carizza (Biarritz Olympique), Agustin Creevy (San Luis), Juan Fernandez-Lobbe (Toulon), Genaro Fessia (Cordoba Athletic), Mario Ledesma (Clermont), Juan-Manuel Leguizamon (Stade Francais), Rodrigo Roncero (Stade Francais), Martin Scelzo (Clermont), Santiago Guzman (Tucuman RC), Nicolas Vergallo (Dax)