The Inter boss believes the midfielder will justify his 35 million euro price tag and also conceded that Xherdan Shaqiri and Davide Santon could leave the club this summer.
Inter coach Roberto Mancini says believes new signing Geoffrey Kondogbia can become one of the world's best midfielders.
The 22-year-old sealed a 35 million euro switch from Monaco last month, snubbing City rival Milan to sign a five–year deal with the Nerazzurri.
And Mancini is confident the France international will justify his hefty price tag.
"Geoffrey can become one of the best players in the world,” said Mancini.