Of greater concern are the ankle injuries to Carragher and Riise, neither of which have fully healed yet.
Carragher will know by Wednesday if he can step up his comeback at Melwood to give himself a realistic chance of facing the Blues.
Riise, who is still receiving treatment at Melwood, has now been ruled out of Norway's Euro 2008 qualifier with Moldova on Wednesday.
Liverpool insist there was no chance of their full-back being fit enough to play in the game.
At this stage, both Carragher and Riise are no more than '50-50' for a derby place.
Benitez faces an anxious wait to see if the rest of his international contingent return unscathed on Thursday morning.
The international double bill couldn't have come at a worse time with Liverpool facing three tough away fixtures - at Goodison, against PSV Eindhoven next Tuesday and Chelsea on September 17.