The Germany worldwide has been a key player for Madrid since joining from Bayern Munich in 2014, with Los Blancos winning the Champions League in each of the last three seasons.
Kroos' first-team opportunities could be restricted by new arrivals and, while saying that he is a fan of the 29-year-old, Zidane could not confirm whether he would still be at the Santiago Bernabeu for 2019-20.
Los Blancos' poor performance this season also paved way for the return of Zinedine Zidane who is now planning for next season as Real Madrid have lost out in all competitions.
"He's a great player that brings calm".
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Benzema has been, by a distance, Madrid's most consistent player this season and he showed again why Zidane has already said the striker will stay. I've always liked him.
"The changes will be made known at the end of the season".
Another player whose future at the club remains unclear is Gareth Bale. "We will see what changes we make and which players we will change".
However, the Wales worldwide has endured a considerable amount of criticism from supporters this season, many of whom feel he hasn't sufficiently filled the void left by Cristiano Ronaldo's departure to Juventus.