"Both players will not be available for this game. It's a shame because they are both important players for us, but we have enough players and enough competition within the squad to cope," said Rafa Benitez.
"Carra is improving which is good news. I need to talk to the doctor to find out more and to see how long he will be out for.
"It's clear that with Steven we need to take care of him. He could be available for the game at the weekend but we'll have to see. Again I will need to talk to the doctor first because I don't want to run the risk of losing him for a long time.
"This week we will keep him training and keep him fit and then see about the Derby game on Saturday."