The former Nerazzurri striker believes the 50-year-old trainer just needs time and patience to rebuild the San Siro side.
Jurgen Klinsmann is in no doubt that Roberto Mancini is the right man to restore Inter to its former glory.
The Nerazzurri won the treble in 2010 and remain one of the game's most famous names.
However, they have struggled both on and off the field in recent years, resulting in former owner Massimo Moratti handing over control of the club to Erick Thohir in November 2013.
Inter has yet to regain its place among Italy's elite, let alone Europe's - despite the subsequent return of Mancini, who won three consecutive Scudetti during his first spell at San Siro between 2004 and 2008.