The former Bianconeri defender says that no side in Italy's top flight ever had any chance of stopping Antonio Conte's men from claiming a third successive ScudettoRoma, Napoli and Fiorentina are merely scrapping to see who finishes second to Juventus.
Antonio Conte's men are currently eight points clear of the Giallorossi, who are four and seven points clear of the Partenopei and Viola, respectively.
Consequently, while Ferrera was mightily impressed by Roma's performance in knocking Juventus out of the Coppa Italia on Tuesday night, the former Bianconeri defender does not believe that it changes anything in terms of the battle for the Scudetto.
"It was an enjoyable game between two great teams playing good football," the ex-Napoli boss said of the quarter-final clash at the Stadio Olimpico in an interview with Tuttosport.
"Roma were more incisive and deserved their passage into the next round. But has it reopened the championship race? It was never open!
"Juventus, technically and in terms of how they play, are superior to all of the others.
"It's a championship in which everyone else is playing for second place - as first place has already been decided.
"[Second] is a fight between Roma and Napoli, even though I wouldn't exclude Fiorentina, given the great season they're having.
"Napoli can do it, but it will be difficult if Roma continue as they are."