City beat Roma 2-0 at the Stadio Olimpico to join Bayern Munich in the next round of the prestigious European club competition.
The English goalkeeper said that his teammates knew that they were a strong unit and believed in a positive outcome, according to the Manchester Evening News.
"We've got resolve, we've got character and we've got great players.
"Add that all together and you have a chance.
"It was a great performance and we're moving in the right direction. We've won five or six games on the spin now and we've really stepped it up." Hart told Sky Sports 5.