Juventus striker Cristiano Ronaldo is one of the worst weeks in his career, having been replaced in successive Champions League and Serie A matches.

If the first was justified because it came in the 83rd minute against Lokomotiv Moscow, the second was unexplained yesterday against Milan, because it was in the 55th minute.

Remarkably, after being substituted in the match against the Russian team was the result of a 1-1 draw before Douglas Costa entered the deadly goal, as well as in the game "Rossoneri" as the result was negative and scored Paulo Dybala - substitute Ronaldo - the winner after 22 minutes of playing.

Italian newspapers described Ronaldo's week as "a week of forgetting" and headlined the newspaper "La Gazzetta" "Cristiano went out and entered Juventus."

But what happened yesterday in the game? And why replace "Don"?

Juventus coach Mauricio Sarri says: "Ronaldo should be thanked for having sacrificed and played with excellent physical conditions. I had to replace him because he was not ready, and naturally angered any player when he was replaced, especially if he worked hard to stay on the pitch. "But I saw that he was not feeling well and the best was getting him out. During the last month he suffered a knee injury that affected his performance and that's why he is not at his best."

"I decided to replace Ronaldo because I was afraid that his injury could get worse if he finishes the game."

However, Sarri's words - which came after the game - was not signed by Ronaldo, who was upset and whispered in some phrases to Sarri, and walked directly to the dressing rooms, and reportedly left the stadium minutes before the end of the game.

But Sari, who praised Fabio Capello for his courage to replace Ronaldo, managed to clinch the points of a game that was complicated by involving Dybala in the place of Ronaldo. .

The 35-year-old, who turns 35 in February, appears to be under fire. "I don't support what Ronaldo did, he should be a hero even when he is replaced," said former Juventus coach Capello.

"The truth is that Ronaldo has not managed to dodge any opponent for almost three years. Dybala shows well and makes a difference, and Douglas Costa can do that too."

Capello praised Sari's courage to replace Ronaldo, saying: "Everyone in the team can play and make a difference."

"Ronaldo makes the difference, but now he is not the decisive player. He has to recover, especially on a physical level. He did not have the speed and dynamism he showed in previous periods."

Ronaldo is the top scorer in Serie A this season, scoring five goals in 12 games.