Ogbonna signed for Torino in 2002, having previously been a member of Nuova Cassino's youth set-up. Ogbonna made his debut in Serie A at the age of 18 under Alberto Zaccheroni. After a loan spell at Crotone in Serie C1, he returned to Torino, with whom he played for a further five seasons. In July 2013, he transferred to city rivals, Juventus, winning the "Scudetto" in 2013–14 and 2014–15, as well as the 2013 Supercoppa Italiana and the 2014–15 Coppa Italia.