PSG visited Bayern's Allianz Arena on Tuesday and a section of the home support unveiled a banner with a profanity aimed at the "plutocratic Al-Khelaifi".
"We concede a lot of goals because we are not stable," complained Guardiola.
Bayern Munich striker Harry Kane hit back at criticism levelled at him, saying he would do his "talking on the pitch" after becoming the fastest to 50 goals in Bundesliga history on Friday.
The German giants, who went without a trophy last year for the first time since 2012, are primed for a return to the winner's circle.
Struggling in Europe after back-to-back losses left them outside the knockout places, Musiala broke through the stubborn Benfica defence, heading in a Harry Kane assist.
Bayern Munich will learn from their 4-1 Champions League defeat to Barcelona but the German team's belief in a successful season is intact, coach Vincent Kompany said on Saturday ahead of Sunday's league game against VfL Bochum.
Bayern Munich coach Vincent Kompany and his Bayer Leverkusen counterpart Xabi Alonso on Friday joined the growing chorus calling for action on player workload, amid talks of strikes.
A street next to Bayern Munich's Allianz Arena stadium will be renamed to honour German football great Franz Beckenbauer who died earlier this year, the city council announced Thursday.
"Something big is coming," Neuer told reporters ahead of Tuesday's opening clash with Dinamo Zagreb at home.
Bayern Munich scored twice in four minutes against the run of play through Lucas Hernandez and Leroy Sane to beat Barcelona 2-0 in their Champions League Group C match on Tuesday.
Bayern Munich had made their best Bundesliga start ever with 15 goals scored and only once conceded in the last three games, but on Saturday, they had 33 attempts at goal and could beat Borussia Monchengladbach goalkeeper Yann Sommer only once when Leroy Sane finally equalized in the 83rd minute.
Bayern Munich were placed in the same section as Robert Lewandowski's Barcelona in Thursday's draw for the UEFA Champions League group stage in Istanbul, while Erling Haaland will face his former club as Manchester City were paired with Borussia Dortmund.
Champions Bayern Munich fired five goals past woeful Eintracht Frankfurt in the first half on the way to an electric 6-1 victory in the Bundesliga season opener on Friday.
Bayern Munich's summer recruit Sadio Mane wasted no time fitting in with his new teammates, revealing he brought his own lederhosen with him to the Bavarian capital this summer.
Star Bayern Munich forward Sadio Mane has wasted no time fitting in with his new teammates, revealing he brought his own lederhosen with him to the Bavarian capital this summer.
German champions Bayern Munich survived a late comeback from RB Leipzig to claim a 5-3 victory in the German Super Cup on Saturday with an impressive first half attacking display and new signing Sadio Mane scoring on his debut.
Poland striker Robert Lewandowski has criticised former club Bayern Munich's "politics" after leaving them to join LaLiga side Barcelona.
Bayern Munich chief executive Oliver Kahn said on Wednesday that making a move for Cristiano Ronaldo in the transfer market would not fit the club's "philosophy".
Erling Haaland launched his Manchester City tenure with a goal as Pep Guardiola's men beat Bayern Munich 1-0 in a weather-disrupted friendly at Lambeau Field in Wisconsin on Saturday.