Referee Daniele Chiffi sent Costa off after consulting the VAR. It was ugly, I am aware of that and I apologise to everyone for that.
"I want to make it clear that this isolated incident is not reflective of how I have carried myself throughout my career".
Now Costa could see the Italian authorities clamp down on his behaviour.
Sky Sports Italia asked Allegri about the incident involving the Brazilian, and the manager said: "Maybe he was irritated at a foul before, but it doesn't matter, because this absolutely must not happen".
"The only thing we have to avoid doing this year is rising to the provocation".
Ronaldo is the joint-highest rated player on the game with Lionel Messi on 94 but Moberg joked about the fact that Ronaldo's physicality rating is lower than his.
He was named man of the match and boss Allegri praised the superstar.
The Portuguese star made good on Allegri's prediction when he scored five minutes into the second half, after Juve had failed to translate their dominance in the first half onto the scoreboard.
"But he has been working well and I think that tomorrow he will score against Sassuolo".
With his first brace in Serie A, Ronaldo has gained his 400th league goal making him only the fifth player in history to reach such milestone. The second goal was brilliant.
Ronaldo was delighted to get off the mark for his new club.
The Brazilian's challenge did nothing to prevent Sassuolo scoring - and then it all got much worse.
"Compared to the English Premier League, football is different, the teams defend themselves very well and give fewer chances".