Defender Miguel Britos bundled the ball home at the death after Liverpool had come from 1-0 and 2-1 down to lead 3-2 thanks to a three-minute blitz in the second half, when new signing Mohamed Salah made an impact.
"For sure it was a key moment, because after this red card we lost our composure and we conceded three goals and I think we have to improve a lot on this aspect".
Burnley hit the post with a free-kick and the match ended with yet another surge from Chelsea who had run out of time to complete their fightback.
Chelsea had their first real chance at goal 11 minutes in when Cesar Azpilicueta's low cross was deflected and almost sat up for Willian to fire home in the centre of the goal.
Looking back at today and the defending champions are in action at 3PM against Burnley, with Antonio Conte hoping to get off to the best possible start to the season with his Chelsea side, maybe even seeing new signing Alvaro Morata get amongst the goals.
Alvaro Morata made his Stamford Bridge debut for the ineffective Michy Batshuayi just before the hour mark, and it was his introduction that seemed to turn the tide in favour of the home side.More news: Manchester United can challenge for league title, insists Matic
More news: United States tells China to fully execute NKorea sanctions
More news: How major USA stock market indexes fared Thursday
Eden Hazard, Pedro Rodriguez, and Tiemoue Bakayoko are injured, striker Diego Costa is estranged, and Conte has a threadbare squad after selling midfield anchorman Nemanja Matic to rival Manchester United and loaning out numerous club's youngsters.
Alvaro Morata nearly inspired a comeback as a second-half substitute, scoring before setting up a late strike for David Luiz, a goal that came after Cesc Fabregas' removal for a second yellow had seen Chelsea reduced to nine men.
Chelsea have the added pressure of Champions League football this season, and could find themselves fielding a string of inexperienced youth players across all four competitions they will take part in, if they don't strengthen their ranks.
Conte said: "I prefer not to answer questions about Costa - for me it's in the past".
"We controlled the counter-attacks and we didn't concede one chance", Guardiola told BBC Sport. "No, if we're honest", said Burnley manager Sean Dyche. "I am ready to fight with these players". I want to say thank you to the club. "This win won't do us any harm at all but it won't make our season".
NAN also reports that Wayne Rooney scored the winning goal on his top-flight return to Everton after 13 years.