The true strength of Italian giants Juventus will be assessed over the next 10 days, says striker Mirko Vucinic.
The Old Lady face arch-rivals Inter at San Siro on Saturday before then travelling to Napoli a week later.
"They are both great sides, very strong," the Montenegro international told La Stampa on Friday.
"Inter are starting to recover and you can already see the hand of Claudio Ranieri. These two games will tell us who we really are."
Vucinic worked under Ranieri at Roma and he fears the difference that he is making at Inter after replacing Gian Piero Gasperini.
" I would take Ranieri out of the Inter equation if possible," he added. "He'll really fire them up, like he did with us at Roma.
"It's my son Aleksandar's birthday on Monday and if I score at San Siro then I'll dedicate it to him."
Vucinic is, after being used as a centre-forward this season, set to be fielded in a wide attacking role against the Nerazzurri.
"I'll play at full-back if it means helping the team win…"