Manchester City striker Sergio Aguero fainted during half-time of Argentina's friendly against Nigeria due to a drop in blood pressure, The Sun have reported.
The 29-year-old was taken to hospital for tests after collapsing in the dressing room midway through the 4-2 defeat.
Aguero had scored in the first-half, but was forced to withdraw and undergo tests to determine the cause.
Argentina's team doctor, Donato Villani, revealed that the forward has had previous problems with his health.
"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", he said.
The Argentine Football Association, meanwhile, took to Twitter to confirm that Aguero,
"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."