The Brazilian conceded that tempers flared in the away dressing room after the match but is adamant that the European champions are now looking ahead to facing the Serie A leaders.
"The dressing-room reaction after the game was that we were upset and angry," said Luiz. "We were disappointed because we should have won the game.
"There were raised voices but that is normal. This is a big club and we don't like to lose games. We missed the moment but all we can do now is look ahead to the next game.
"What's past is past and the future is Juventus. It will be difficult and Juventus are a great team. They are just one point behind us. This is the most important game in the group."
Chelsea travel to Juventus on Wednesday in the Champions League.