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's Senegal forward Sadio Mane has joined Saudi Pro League club Al-Nassr after one season with the Bundesliga champions, both clubs said on Tuesday.
Bayern Munich boss Thomas Tuchel said Tuesday he was saddened that things didn't work out for Sadio Mane at the club but feels his departure is for the best.
Next up for City is a clash with Atletico Madrid in Seoul on Sunday, before they return to England to take on Arsenal in the Community Shield.
The 29-year-old Austrian vice-captain has undergone a medical and signed a contract until June 2027, his new club announced.
If ninth-tier side Rottach-Egern thought Bayern Munich would use Tuesday's pre-season match as a chance to gently shake off the rust after a lengthy break they were sadly mistaken, with the ruthless German champions running up a 27-0 victory.
South Korea defender Kim Min-jae has joined German side Bayern Munich on a five-year contract from Serie A champions Napoli, the Bundesliga club said on Tuesday.
New Tottenham coach Ange Postecoglou said on Monday Harry Kane was "totally committed" to his vision for the north London club as speculation mounts over the England captain's future.
Bayern Munich's honorary president Uli Hoeness has expressed confidence that England captain Harry Kane will join the German giants from Tottenham Hotspur.
Paris St Germain have signed defender Lucas Hernandez from Bayern Munich on a five-year deal, the Ligue 1 champions said on Sunday.
The German champions are said to be intent on securing the signing of England's record scorer, whose contract with Spurs runs out in 2024