Chelsea had dropped to fifth in the table after losing two of their previous three league games - a run that included reverses against rivals Liverpool and Arsenal - but they returned to winning ways at home today thanks to goals from John Terry, Daniel Sturridge and Juan Mata.
"In my opinion chaos happened. We were exposed a couple of times with group mistakes (in recent games)," Villas-Boas said.
"Now we have to correct them to make sure we are on the right track. From now on so it's a good challenge for the team and hopefully we can now respond in this period.
"December will be important. We have a Champions League fixture still to play but the rest of the games are in the Premier League and this month will play a big part in what happens in the league.
"We have some important games. Newcastle away, Manchester City at home and Tottenham away, these are difficult games but can make a difference for us in the table."