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.
Corentin Tolisso struck twice as Bayern Munich avenge September's defeat at Paris Saint-Germain with a 3-1 victory in Bavaria but the French side finish top of Group B.
Bayern Munich must make sure they bring in top players every season to stay competitive and ease the pressure on an ageing squad, Poland captain Robert Lewandowski says.
Bayern Munich stamp their authority on the Bundesliga by opening a four-point lead at the top of the table as Robert Lewandowski netted an audacious goal in their commanding 3-1 win at Borussia Dortmund.
Robert Lewandowski is set to return to action for Bayern Munich this weekend as they look to score an important victory over troubled title rivals Borussia Dortmund.
Diego Simeone defends Atletico Madrid's style as another profligate performance left his side on the brink of an early Champions League exit after being held 1-1 at home by 10-man Qarabag.
Bayern Munich squeeze past 10-man RB Leipzig in dramatic German Cup second-round clash with a 5-4 win in a penalty shoot-out after Timo Werner missed the final crucial kick.
Bayern Munich ease past Celtic 3-0 in the Champions League to hand coach Jupp Heynckes a victorious return to the competition he won with them in 2013.
Jupp Heynckes has come out of a four-year retirement to take charge of Bayern Munich for a fourth time, but divides opinions on whether the treble-winning coach can boost their flagging fortunes.
Legendary German coach Jupp Heynckes will replace sacked Carlo Ancelotti as Bayern Munich's manager until the end of the season, Sport Bild newspaper says.
Bayern Munich again surrender a two-goal lead in a 2-2 draw at Hertha Berlin in their first match since Carlo Ancelotti's shock sacking, slipping to five points behind leaders Borussia Dortmund.