Los Blancos have reacted angrily after the Fifa president made fun of the Portuguese during a debate at the Oxford Union
The Fifa president, 77, discussed the merits of Ronaldo and Lionel Messi during a debate at the Oxford Union in which he suggested the Portuguese cared more about his image than his efforts on the pitch.
He said: "Leo’s a good lad. Every father or mother would like to have at home. He’s a good man, very fast and he’s not exuberant. He’s a kind man, he’s a really good boy.
"The other [in reference to Ronaldo], is a commander on the field of play.”
Blatter then proceeded to march across stage mimicking the movements of a military parade in a bid to make fun of Ronaldo before concluding with another jibe at the Madrid star.
"One spends more at the hairdresser’s than the other, but I can’t say who is better. I like them both, but I prefer Messi."
Ancelotti addressed the media ahead of his side's clash with Sevilla on Wednesday and revealed his disappointment at the comments, while praising Ronaldo's continued professionalism.
He said: "I know that our President has sent a letter to Fifa.
“This is a lack of respect towards a player who is very serious and very professional. I agree with the president.
“I have not spoken with Cristiano about it. He trained very well, as usual I think that it demonstrates that in every game, he is a great player.
“He is serious, professional and respects everyone. He has to continue like this and nothing more.”
The news comes after both Messi and Ronaldo were named on a 23-man shortlist for this year's Ballon d'Or on Tuesday.