Chiellini insists Juve are capable of winning the title this season - but only if they have the mental strength to win the big games.
He said: “Whoever wants to stay at the top must win games with another spirit.
“We didn't show the right attitude against Fiorentina in the first 30 minutes.
Asked for a reaction to his goal, Simone Pepe said: “When I saw the ball go in I said to myself: 'Come on, let's go and win'.
“It's still too soon to talk about the Scudetto, but we must think big.”