Davids, who played for both Juve and Barca, believes the Catalan club will still pose a real threat despite the departure of Neymar.
"If you want to hurt Dybala, then continue making such comparisons", Davids told Gazzetta dello Sport.
Argentine Messi and Portuguese Ronaldo have won nine FIFA World Player of the Year awards between them.
Dybala is a brilliant player, combining speed, technique, and vision to create opportunities for himself and his teammates in a manner not all that dissimilar to Eden Hazard. As of this weekend, Dybala is joint top of the goalscorers chart on five goals alongside Mauro Icardi of Inter Milan. To go three games against them without conceding a goal [this year] would be extraordinary. These criticisms make me laugh, I mean to play well at football, what does that actually mean? One recent prime example is the acquisition of Paulo Dybala, who has become one of Europe's best young talents since his €40 million move from Palermo.
And Allegri was pleased with the way Dybala is fitting into the team's scheme of things.
Rare exceptions aside, such as Gonzalo Higuain's €90 million signing from Napoli in 2016, Juventus are known for finding great deals even in today's lopsided transfer market. Napoli, now joint top with Juventus and Inter, confirmed their good seasonal start with an impressive 3-0 defeat of Bologna on Sunday night. "In their best years they had Xavi and [Andres] Iniesta at their best". The path to the Olimpiyskiy stadium in Kiev next May is just beginning and already the road is rising with some teams.