The player has been out of action since January following a serious leg break and has yet to play again for Everton. He has been called up for the world cup qualification tie against Hong Kong.
"It is such a big game for China that they are desperate to have him," Moyes told Everton's official website. "We might let him go to help with their morale as he is such an influential player, but he is not ready to play. He looks as if he is still a good couple of months away from being fully fit. It is a cause for concern."