The young Brazilian attacker is regarded as one of the top prospects in the game, and he has been tipped to emulate the likes of Neymar.
Inter president Erick Thohir has backed Gabriel Barbosa to be an integral part of the club's revival after agreeing a five-year deal at San Siro.
The 20-year-old was one of football's hottest properties during the transfer window following his exploits for Santos and Brazil, with a host of European clubs reportedly vying for his signature.
Leicester City, Paris Saint-Germain, Manchester United, Borussia Dortmund and Juventus were all linked with a move for the striker, but he chose Inter.