The teenage sensation on Thursday claimed he has completed a dream move to the Old Lady and will jet out to Italy after the South America Under-20 championship
The midfielder, who plays for Quito, also insisted he will fight for a first-team place with the Bianconeri, despite only turning 18 last week.
"I am very happy and very proud that after weeks and months of negotiations, the transfer has gone through," he told Ecuador TV.
"I have already signed the contract. As soon as the tournament ends, I will go straight to Turin. I’ll fight to earn my place and I am certain with God’s grace it will go well."
Cevallos' father, Jose Francisco Snr, was a legendary goalkeeper in Ecuador, who faced up against his son's soon-to-be captain Gianluigi Buffon in the 2002 World Cup.
He added: "In the 2002 World Cup, Gigi Buffon exchanged shirts with my father. If I get the chance, I’ll ask him if he remembers that."