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.
The row between Bayern Munich team mates Sadio Mane and Leroy Sane could actually make the German side more dangerous in the second leg of the Champions League quarter-final on Wednesday, Manchester City manager Pep Guardiola said.
Borussia Dortmund failed to take advantage of Bayern Munich's 1-1 home draw against Hoffenheim on Saturday, blowing a two-goal lead against 10-man Stuttgart before conceding a last-gasp equaliser.
Mane was suspended for this weekend's Bundesliga game against Hoffenheim after reportedly having a physical altercation with Sane following Tuesday's Champions League defeat at Manchester City
"Sadio Mane, 31, will not be in the FC Bayern squad for the home game against 1899 Hoffenheim next Saturday," Bayern said
Bayern Munich's Sadio Mane and Leroy Sane clashed in the dressing room after the German club's Champions league quarterfinal first leg defeat to Manchester City, according to reports in Germany on Wednesday.
New coach Thomas Tuchel said on Friday his first week at Bayern Munich "felt like a month" in preparation for Saturday's 'Der Klassiker' clash with league leaders Borussia Dortmund.
"It's always difficult when a coach goes, and I had a very close relationship with Julian," Goretzka told ZDF broadcaster after Germany's 2-0 friendly international win over Peru
Bayern Munich were poised Friday to announce that they have sacked coach Julian Nagelsmann, replacing him with former Chelsea coach Thomas Tuchel just days before crucial Champions League and Bundesliga games next month.
Bayern Munich have fired their coach Julian Nagelsmann, Bild newspaper reported on Thursday.
Argentina's World Cup winner Exequiel Palacios struck twice from the spot as Bayer Leverkusen blew the Bundesliga title race wide open with a shock 2-1 win over Bayern Munich on Sunday.