Benitez wants to give the Dutchman a rest as he has played in most of Liverpool's games this season and is looking tired and playing poorly.
"We have had some players who have had to play too many games this season and that is a consequence of the injuries," said the boss.
"But I’m sure that if we have some more players we will be able to manage in a different way and give the ones who need it some rest, so they will be fresh for the next match. Dirk has played too many games, we know this.
"He could have had a little break against Fiorentina but David Ngog was ill and we needed to play him.
"But we know Dirk will get back to his levels, for sure.
"He is an amazing player, his work rate is fantastic and we can see that because we are watching all their statistics.
"He is always one of the players who runs the most during a match but we want him to have a rest if he can because I think that will help improve his game."