David Trezeguet, meanwhile, has not seen eye to eye with Ranieri for weeks, and has been excluded despite having recovered from injury.
Ferrara will certainly have the full backing of the club's supporters - something Ranieri could rarely claim to have received - after being a firm fans' favourite during over a decade as a player for the Bianconeri.
This is his first role as a club coach, having previously worked as Marcelo Lippi's right-hand man with Italy and he hopes to turn around the club's fortunes over the next fortnight.
"We have two cup finals ahead and we have decided to play this ace that we had up our sleeves," he said.
"Now it is up to the squad to demonstrate that the work they have done this year can be concluded in the right way."
Juventus travel to Siena at the weekend before hosting Lazio on the final day of the season at the Stadio Olimpico.
Only two wins from those games can guarantee Juventus a place in the group stage of the Champions League next season.
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