"It's impossible to think Cristiano would only score one goal in this Champions League," Allegri said.
"He scored because he played well in the box and his team-mates worked well in the gameplay.
"A great match with an outstanding crowd supporting us and the players gave all Italian football fans a real show. That's the most important thing."
Ronaldo is in his debut season with Juventus, having joined from Real Madrid in the summer.
While at Madrid, Ronaldo won three Champions Leagues in a row and left the Spanish capital just weeks after lifting the trophy for a fifth time in his career.
Cristiano Ronaldo: Juventus boss makes ‘impossible’ claim after Champions League hat-trick (Image: GETTY)
Cristiano Ronaldo netted his eighth Champions League hat-trick as Juventus beat Atletico Madrid (Image: GETTY)
He netted 450 goals for Los Blancos and is the leading goalscorer in Champions League history.
After Tuesday’s heroics, the 34-year-old has now scored 124 goals in Europe's elite club competition.
He has bagged eight hat-tricks in the Champions League, level with Barcelona star Lionel Messi, and that was his first for Juventus.
And the former Manchester United star believes he showed his worth in Turin on Tuesday night.
Ronaldo told Sky Sport Italia: “It had to be a really special night and it was.
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