Ezequiel Garay was forced to miss Argentina's training session on Wednesday due to the stomach complaint, clouding his Copa America final availability.
Garay missed Argentina's 6-1 semi-final thrashing of Paraguay on Tuesday due to a bout of gastroenterocolitis, and the Zenit defender continues to battle the ailment in the lead-up to Sunday's final against hosts Chile in Santiago.
The 28-year-old remained at the team hotel on Wednesday while his team-mates trained at the Estadio CAP in Huachipato.
Garay is manager Gerardo Martino's favoured centre-back partner to Nicolas Otamendi, but should he fail to recover, Manchester City's experienced defender Martin Demichelis will retain his spot in the starting line-up.
Argentina worked on recovery drills during their light work-out, while some squad members including Carlos Tevez, Gonzalo Higuain and Erik Lamela, practiced ball retention under the watchful eye of Martino and his staff.
The 14-time Copa winners can join Uruguay as the equal-most successful nation in the continental showpiece with victory over Chile, who are looking to win their maiden title.
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