Juve pulled off the summer's biggest transfer by bringing in Ronaldo from Real Madrid, while Costa flourished under Allegri's command in his first season as a Bianconero.
New Liverpool goalkeeper Alisson Becker could also be named as the Champions League's best goalkeeper for his performances at former club Roma, but the Brazilian will need to see off Madrid's Keylor Navas and Gianluigi Buffon - who played for Juventus but is now at Paris St Germain.More news: Turkey ready for trade with partners, including Russian Federation , in national currencies - Erdogan
He, however, believes the five-time Ballon d'Or victor can take the Old Lady to the next level in their pursuit of European glory. Established custom dictates that five minutes after half-time fans invade the pitch, bringing the game to a halt as fans charge after and greet their heroes.
"Having Ronaldo here will at least mean that if we meet Real Madrid we won't be starting the match already 1-0 down", said Bonucci, who has returned to Juventus after a year with AC Milan, at his official presentation in Turin.More news: Paul Pogba named Manchester United captain against Leicester
Ronaldo's arrival in Italy will see Serie A become one of the most popular leagues in the world.
The decision to deprive themselves of a proven Serie A goalscorer and in particular to swap Caldara, 24, for 31-year-old Bonucci has left some question marks over Juventus despite Ronaldo's proven prowess. "He's played an important role in my career". He helped Real Madrid bag the La Liga title twice and Champions League title four times, since his record breaking move from Manchester United.More news: Jurgen Klopp: Liverpool will go again after Champions League final loss
Ronaldo's sensational €100million switch to Juventus prompted speculation that Madrid would move for a new forward but Ceballos said the talents of Bale, Karim Benzema and Asensio would compensate for the loss of the Portuguese.