Dybala came off contract at Juve over the summer to eventually sign for Roma.
Tardelli told TMW: “I didn't understand the story. Dybala is an excellent player and something has happened at Juve that we don't know.
"We all thought that he could grow more, but after covid there was a decline in affection for the environment.
"Yesterday he played a decent game, I think he can go well for Roma and he will do great things with the coach's confidence. I can't tell you if I would have kept him at Juve or not: he was a player able to 'move'; he could perhaps have had more patience."