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 striker Harry Kane said Robert Lewandowski's league goals record was "still a bit too far away" despite again scoring a brace in a 4-2 win over Heidenheim on Saturday.
Real Madrid, Bayern Munich, Inter Milan and Real Sociedad all qualified for the last 16 of the Champions League with two group games to spare on Wednesday.
With the scores locked at 1-1 and the match looking destined for extra time, defender Gaus netted in the sixth minute of injury time to grab his team a famous victory.
Bayern Munich striker Harry Kane joked that he would have to keep the match ball in his hotel room after scoring a Bundesliga hat-trick against Darmstadt on Saturday, as he is still yet to find a house in Munich.
Bayern Munich goalkeeper Manuel Neuer admitted that he was no longer Germany number one after making an emotional return to Bundesliga action from a year-long injury on Saturday.
Kane lobbed goalkeeper Marcel Schuhen from the centre circle to score Bayern's fifth and his second as Bayern tore Darmstadt apart on a rollercoaster afternoon for the champions.
Bayern lacked fluidity and struggled against an impressive Copenhagen side, who grabbed the lead early in the second half thanks to Lukas Lerager's opener
Manchester United coach Erik ten Hag on Tuesday backed his side to come through their early-season struggles ahead of Wednesday's Champions League tie with Bayern Munich.
Bayern Munich coach Thomas Tuchel on Tuesday backed the rumoured appointment of the man he replaced in the dugout, Julian Nagelsmann, for the Germany job.
Bayern Munich striker Harry Kane said he "still had room to improve" after netting a fourth goal in four matches in his side's 2-2 home draw with Bayer Leverkusen on Friday.