"The days that led me to this signing were a combination of many emotions: the determination and the speed with which Roma showed they wanted me made the difference," Dybala said.
"I am joining a growing team, with a club that continues to lay ever more solid foundations for the future and a coach, Jose Mourinho, with whom it is a privilege to be able to work. As an opponent I admired the atmosphere created by the Giallorossi fans, I can't wait to greet them with the Roma shirt on."
La foto che stavate aspettando pic.twitter.com/lYYMEODs3m— AS Roma (@OfficialASRoma) July 20, 2022
"He has already joined up with his new teammates at the training camp in Portugal and will begin preparations for the new season this week," Roma said.
"Dybala has opted to wear the No. 21 shirt for the club."
Roma finished sixth in Serie A last season and won the Europa Conference League under Mourinho.
They kick off their league campaign with a trip to Salernitana on Aug. 14.
Mourinho guided Roma to an inaugural Europa Conference League title last season, their first continental trophy in 61 years.
It also made Mourinho the second manager to win five major European titles after Giovanni Trapattoni. Roma finished sixth in Serie A last term.
Dybala will look to bring his Juve success with him to Roma. He won five Serie A titles and four Coppa Italia trophies in Turin after he joined from Palermo in 2015.
The Argentina international was also part of the Juve side that reached the Champions League final in 2017, which they lost 4-1 to Real Madrid.