Napoli are now in third place and six points adrift of the Serie A leaders, but Bigon feels they are still in the Scudetto race.
He said: “Of course there are regrets and we would’ve liked to analyse a defeat based only on our own errors and not other elements, but when Milan play like that, it is difficult for any opponent.
“We mustn’t forget all the good work we have done up until now.
“The next test with Brescia will be the most important of the season, just like the one after that and so forth. The support of our public is going to be crucial.”