Manchester United forward Javier Hernandez spent last night in hospital after suffering a mild concussion during a training session at Red Bull Arena, however, after observation, has been cleared.

The problem did not become apparent until United had finished their session in front of thousands of supporters. United manager Sir Alex Ferguson and his medical team were sufficiently concerned to send Hernandez to hospital, where he remained under observation for the remainder of the evening.

The 23-year-old Mexican striker, who had just joined up with his team-mates on Monday, was released today, with Ferguson due to give an update after tonight's match against the Major League Soccer's All-Stars. Hernandez, however, was not scheduled to be involved in the game.

Chicharito [Hernandez] sustained a mild concussion during training last night.
Manchester United statement

Although the extent of his concussion will determine when he will be allowed to play again, including whether or not the forward, who scored 20 goals last season, will feature against Barcelona in the concluding game of United's five-match tour in Washington on Saturday evening.

"Chicharito [Hernandez] sustained a mild concussion during training last night," said a United spokeswoman. "We have taken all the necessary precautions, which included an overnight stay in hospital. The manager will give further updates in due course."