Hernandez suffered concussion after being hit on th head by a ball in training. The Mexican striker was required to stay overnight in hospital.
“Chicharito got concussion in training and we dealt with that,” said United boss Sir Alex Ferguson. “We took him to the hospital, he had a scan, it was all clear.
“But he will be out for a couple of weeks. In saying that, he probably wouldn’t have been playing in a couple of weeks anyway, because he’s just come back from his break after playing in the Gold Cup for Mexico.
“He wasn’t going to be involved in our team for two or three weeks anyway. The ball hit the top of this head but he’ll travel with us. He’s okay to travel.”