Angel Di Maria trained normally for Argentina on Wednesday and will be fit for his side's Group F clash against Iran on Saturday.
The Real Madrid winger had been struggling with a muscle strain since Argentina's 2-1 win over Bosnia-Herzegovina on Sunday and underwent special fitness work on Tuesday.
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Inter striker Rodrigo Palacio is also fit after recovering from an ankle problem that kept him out of the squad on Sunday.
"All of the players trained normally today and Di Maria has recovered from his knock," Argentina's press officer told reporters after Wednesday's session.
And Boca Juniors goalkeeper Agustin Orion added: "You always get knocks and niggles, but luckily all of the players trained today and they are all available to the coach [Alejandro Sabella] for selection."
Argentina top Group F after beating Bosnia-Herzegovina and will seal a place in the last 16 on Saturday with victory over Iran, who drew with Nigeria on Monday.