Sergio Aguero was taken to hospital after fainting in the dressing room at half-time in Argentina’s 4-2 defeat by Nigeria in Krasnodar, Russia.
The Manchester City striker had scored to put his side 2-0 up in the first half, but Arsenal’s Alex Iwobi found the net twice as Nigeria came back.
The Argentina FA said the 29-year-old had been taken to hospital to “carry out routine studies as a precaution”.
They later confirmed that Aguero had been discharged from hospital.
“He is already in the hotel along with the rest of the team,” they tweeted.
After the match Argentina manager Jorge Sampaoli said Aguero had “got dizzy and had to leave”.
Super Eagles won the match 4-2.