Musa scored twice as the Premier League champions came from a goal down to defeat the Toffees at Goodison Park.
“Musa was excellent. I’ve watched him recently and think he is starting to understand English football better,” Ranieri said in his post-match conference.
“Very pleased. We made a good match against a big team we lost to at home. I loved our reaction to conceding a goal.”
Ranieri was also happy with Ndidi, who he says only trained twice with his new team-mates before the game.
“Ndidi only trained two days with us, but he showed strong character and personality. A great performance,” Ranieri added.
“I want to say thank you to our fans. A great number of them travelled here today and their support was fantastic.”