JOHANNESBURG (Reuters) - U.S. striker Jozy Altidore missed training on Thursday due to a sprained ankle, the United States Soccer Federation said on their website (www.ussoccer.com).

Altidore was due to undergo a fitness test on Friday to decide whether he will be available for Saturday's World Cup warm-up match against Australia in Johannesburg.

The U.S. begin their Group C campaign against England on June 12. They will also play Algeria and Slovenia.

(Editing by Ed Osmond)