The Germany international made his competitive Blancos debut on Tuesday and his coach was thrilled with his display
The Germany midfielder made his competitive debut in Cardiff along with fellow new arrival James Rodriguez.
And, despite Cristiano Ronaldo scoring the two goals that secured Real's second Super Cup, Ancelotti singled out Kroos for special praise.
"Toni Kroos' performance was perfect," the coach is quoted as saying. "He was quick and clear in everything he did.
"The new players showed their quality. We're more confident than we were this time last year - and that's rubbed off on the team.
"We have many outstanding players now. It will be important to use this squad in its entirety.
"We may be entering a successful cycle. We have a squad of extraordinary quality."
Madrid take on Fiorentina on Saturday before they kick off their Liga campaign at home to Cordoba on August 25.