Saturday's Champions League final against Borussia Dortmund will be Kroos' last in club football.
Valverde said, "Today I play in another role, different from Toni.
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"We will never be able to replace him, he is the person I admire the most and I would like to be able to do at least ten percent of what he did at Real Madrid, but it's very difficult.
"In the end we have another type of game, there is no player in the world like Toni. We have another way of playing, we will try to continue marking an era in this club, but it will be difficult."