Manchester City forward Sergio Aguero was rushed to a local hospital in Krasnodar after he fainted in Argentina’s dressing room during half-time of Tuesday’s friendly with Nigeria, local media reported.
“Sergio got dizzy and had to leave at half-time,” Argentina manager Jorge Sampaoli said after the game.
Aguero, 29, regained consciousness in hospital, where he remained for tests.
Aguero, who scored the winner in Argentina’s 1-0 victory over Russia on Saturday, netted his team’s second goal against Nigeria in the 36th minute in Krasnodar before he was replaced at the break.
Sport Express daily reported that Argentina’s team doctor took the decision to transport Aguero to hospital as a precaution and to undergo medical tests.
Leicester’s Kelechi Iheanacho netted with a free-kick and Brian Idowu was also on the scoresheet for the Super Eagles, who had fallen behind to strikes from Aguero and Ever Banega.
Nigeria battled back from two goals down to beat Argentina 4-2.
The Argentina FA said he had been taken to hospital to “carry out routine studies as a precaution. The player is in good condition”.
Aguero, who became City’s all-time leading goalscorer earlier this month, had recently returned to action after he suffered a rib injury in a car crash in Amsterdam in September. He was injured when a taxi he was travelling in after attending a concert crashed into a lamp post.