Hoping that the Ox is not injured too badly, he is key to England's world cup. One of the few players in the squad that can make something happen by himself. If England do need to replace him, god knows who Hodgson will choose. He'll probably resort to flipping a coin for Cleverly or Carrick.
If it's not a serious injury and he only misses a week or two, I would definitely still take him in the squad.