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 coach Julian Nagelsmann had previously suggested PSG were playing mind games when they announced the France superstar would not be fit for the first leg
The Parisian club are already without forward Kylian Mbappe for the game against the German champions after he picked up a thigh injury last week.
A stunning solo goal from Bayern Munich teenager Jamal Musiala sealed a controversial 4-2 away win at Wolfsburg on Sunday, sending the visitors back to the top of the table.
Bayern Munich sporting director Hasan Salihamidzic said on Sunday he was "disappointed" with injured captain Manuel Neuer, who "put his personal interests above" the club.
Bayern Munich midfielder Joshua Kimmich is set to make his German television debut with a small role in cult detective show 'Tatort'.
Bayern Munich coach Julian Nagelsmann said on Friday he thinks Kylian Mbappe will play for Paris Saint-Germain in the first leg of their Champions League tie, accusing the French club of "playing poker".
A 90th-minute equaliser from Bayern Munich midfielder Joshua Kimmich saved his side from a second loss of the season, as they drew 1-1 at home against a dogged Cologne on Tuesday.
Bayern Munich manager Julian Nagelsmann said on Friday that injured captain Manuel Neuer remains the club's first-choice goalkeeper, despite the addition of "outstanding" Yann Sommer.
Bayern Munich want to sign a goalkeeper following the injury to Germany captain Manuel Neuer but the options on the transfer market in the winter period are limited, coach Julian Nagelsmann said on Thursday.
Bayern Munich and Germany forward Thomas Mueller has shot down rumours of a pending international retirement, saying on Monday he will "always be available" for selection.