After months of links over a move to Inter, Roma announced Dybala had joined them on Wednesday.
And Allegri, who signed the Argentina international at Juventus said it was the right move for him and wished his former player well.
Speaking at to DAZN, Allegri said: “I believe it is the right club for him and I wish him the best of luck. He is a player who has given a lot to Juventus and I think he will do very well at Roma.”
Asked to elaborate on why he felt Roma were the right club, he added: “He is a very technical player, alongside [Tammy] Abraham up front. Then you have [manager José] Mourinho, who is very good.”
Dybala joined Juve in 2015 at the end of Allegri’s first season in charge of the Bianconeri.
They won the league and cup double in their first campaign together, repeating that feat in each of the next two seasons – even reaching the Champions League final in 2017.
In the final season of Allegri’s first spell with the club, they settled for just the Serie A title but failed to add a single trophy in 2021-22, when the ex-Milan coach returned to the club.