Zidane has picked up where he had left off since returning to the club, winning LaLiga Santander last season and having Los Blancos in contention for a double this term.
"I think he'll be our coach next season," Kroos said, laughing, when put in the uncomfortable position of being asked about Zidane's future during their pre-Chelsea press conference. "He has a contract."
Turning his attention to the Champions League semifinal against Chelsea, the German acknowledged the strength of Real Madrid's opponents but denied that he was overly worried about the trip to London.
"They haven't taken any sleep away from me," Kroos said. "We know their quality and strength.
"I see us in good shape. We've got players back who weren't with us for the first leg, although we have lost Rafa [Varane].
"We're all ready to run and fight until the end, but how we use the ball will be important."