Josemi injured his back in a clash with Nicholas Anelka in yesterday's game and is now doubtful for Tuesday's game with Graz.
Asked about the injury in his post-match press conference, Rafael Benitez said: "Josemi has a problem with his lower back. I don't know if he will be available to play on Tuesday and we will just have to wait and see."
Josemi's injury could give Jon Ostemobor a chance to make his European debut for the Reds.
