Brazil's football federation says striker Gabriel Jesus sustained a broken eye socket during the 1-0 loss to Argentina in a friendly.
The Manchester City player was taken off the field on a stretcher late in Friday's game after being hit by an errant elbow during an aerial challenge with club teammate Nicolas Otamendi.
Jesus was initially given the all-clear after precautionary tests but the CBF says Saturday that, after a more detailed examination, a fracture was diagnosed in the bone that protects his left eye.
Brazil's team coordinator and former Arsenal midfielder Edu Gaspar had previously claimed that Jesus had been given the all-clear.