The Bianconeri went 2-0 up within 12 minutes thanks to Danilo and Gonzalo Higuain goals, but Sassuolo came back to lead 3-2 and could've won it at the death if not for Wojciech Szczesny heroics and an Alex Sandro goal-line clearance.
“A coach expects consistency from his team, it's something we've been lacking both physically and mentally. We have some very strong moments in a match and some moments of passivity that are difficult to understand," Sarri told Sky Sport Italia.
This was their third game in a row without victory, after a 4-2 defeat to Milan - where they had also gone 2-0 up - and 2-2 draw with Atalanta.
“I do believe that if we resolve the issue of consistency throughout the game, we are on the right track. Any team becomes dangerous if you let them pass it around in our final third.
“We struggled because they played between the lines with the trequartista and we gave the ball away too many times. It was strange, as our full-backs in the first half were conservative, but then started to push forward and win the ball back early towards the end of the game.
“It's not so much something that doesn't work as it works in fits and starts. At times, I get the feeling this team has enormous potential. At other times, it leaves you perplexed, as it allows the opponents to enter the box far too easily. We need to find the right balance and that is not easy.
“We had to keep the ball more, as there are times when the passing move will help you to control the tempo and stay in the opposition half. We sometimes feel too rushed in trying to get to the goal in a couple of passes, which creates a situation where you go from end to end."