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.
Saturday's "Der Klassiker" between Bayern Munich and Borussia Dortmund will unusually not be about controlling the title race or taking over the top spot in the German Bundesliga.
Bayer Leverkusen boss Xabi Alonso ended speculation of a potential move to one of his former clubs Liverpool or Bayern Munich in the close season when the Spaniard said on Friday that he was committed to staying with the Bundesliga leaders.
Harry Kane broke a 60-year record for most goals in a debut season while Jamal Musiala scored twice as Bayern Munich won 5-2 at Darmstadt on Saturday.
Bayern Munich forward Harry Kane said he is enjoying every moment as he aims to break more records in Germany after scoring a record setting hat-trick in Bayern's 8-1 thrashing of Mainz 05 on Saturday.
Kane now has 30 goals in his first season in Munich colours, matched the record for a maiden campaign set by Uwe Seeler for Hamburg in 1963-64
Serhou Guirassy scored his 21st goal of the season as Stuttgart beat 10-man Union Berlin 2-0 on Friday to move one point behind second-placed Bayern Munich in the Bundesliga.
Xabi Alonso has taken Bayer Leverkusen to the brink of their first Bundesliga title, but the rising star of European coaching could soon be on the move to Liverpool or Bayern Munich.
Bayern Munich striker Harry Kane hopes Tuesday's 3-0 win over Lazio, which secured progress to the Champions League last eight, will be a "turning point" in the club's season.
Harry Kane scored a goal in each half as Bayern Munich beat Lazio 3-0 on Tuesday to reach the Champions League quarter-finals 3-1 on aggregate.
In February, Bayern announced Tuchel would leave the club at the end of the season, less than a year after replacing the sacked Julian Nagelsmann.