The hosts had goalkeeper Antonio Mirante sent off late in the first half, but despite having 10 men, scored twice in the second half to make it four games unbeaten in Serie A.
He told Sky Sport Italia: "I am happy because the game was a little unbelievable.
"We went ahead thanks to a gift from Sassuolo, but then compromised our chances in the game due to naivety.
"Our reaction was wonderful and I would like to praise the players for it."
The Gialloblu have now won two of their last three league games, recovering from a poor start to sit 10th in Serie A.