The Manchester City striker was on target for his county before reportedly fainting in the dressing room, with the Argentine FA posting on Twitter that Aguero “had a blackout and was taken [to hospital] so routine examinations were made only as a precaution.”
The striker was eventually released and rejoined his international team-mates, who went on to lose the encounter against the Super Eagles 4-2.
Aguero has previously suffered from a heart problem and Argentina team doctor Donato Villani said: “He felt bad twice, and with the medical history he has, since he was operated on when he was 15, we wanted to be sure it was nothing.
“We took him to hospital to make sure everything was normal, we prefer to wait to be sure.”
Manchester City will also keep a close eye on Aguero leading up to this weekend’s Premier League clash against Leicester City.
A statement from the club said: “Sergio Aguero has been cleared by doctors to return to Manchester as planned after suffering a dizzy spell during Argentina’s 4-2 defeat by Nigeria in Krasnodar today.
“Sergio never lost consciousness, and was taken to hospital for precautionary medical checks. He will be assessed by the club’s medical team ahead of this weekend’s Premier League trip to Leicester City.”