The 22-year-old Nigeria worldwide, who is a product of the Blues' youth system enjoyed an impressive spell in Italy during the 2018-19 season after making 32 appearances providing three assists and scoring one goal in all competition for The Maroons.
Cairo confirmed that Torino have taken advantage of a purchase option to sign the Super Eagles star on a permanent deal.
"We exercised our option to buy Ola Aina, as well as [Christian] Ansaldi and [Koffi] Djidji", he said.
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Aina started as a right winger at Chelsea before he was moved into defence. Davide Zappacosta, a £23m signing from Torino in 2017, has struggled to impress at Stamford Bridge, and there was talk of either Aina or fellow youngster Reece James being given Zappacosta's spot in the team next season.
At Torino, Aina was equally as important and he played 30 of the Turin-based outfit's 38 Serie A matches previous year.
However, the Nigerian has now opted to make the permanent switch to Italy, and leaves Chelsea having made just six appearances.
Aina spent last season on loan with Torino, playing 30 games as they finished seventh on the table. He managed to register one goal and three assists in Serie A, operating as a wing back on both sides of the midfield.