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.
Bayer Leverkusen tightened their grip at the top of the Bundesliga with a 2-0 victory over 10-man Cologne to pull 10 points clear of Bayern Munich.
Bayern Munich must follow their 2-1 victory over RB Leipzig with a winning run to get their season back on track, forward Harry Kane said.
Outgoing Bayern Munich coach Thomas Tuchel joked "my bag is packed" after watching his side's 2-1 win over RB Leipzig while sitting on a silver-coloured suitcase on Saturday.
Xabi Alonso said on Friday links to Liverpool and Bayern Munich were "just speculation" and that his "head is here" as he strives to take his record-breaking Bayer Leverkusen side to a first Bundesliga title.
Bayern Munich coach Thomas Tuchel said he was not the only one responsible for his team's bad form and hoped the club's decision to part ways with him at the end of the season would liberate him and his players for the remainder of the campaign.
Bayern Munich have decided to end their collaboration with coach Thomas Tuchel at the end of the current season despite a contract to 2025, the club said on Wednesday.
The 3-2 defeat at lowly Bochum was Bayern's third reverse in a row, after a 3-0 thumping by Alonso's league leaders last weekend and a 1-0 midweek loss at Lazio in the Champions League.
Champions Bayern Munich crashed to a 3-2 loss at VfL Bochum on Sunday for a third straight defeat in all competitions that saw them drop eight points behind Bundesliga leaders Bayer Leverkusen.
Ciro Immobile fired Lazio towards a first Champions League quarter-final in nearly a quarter of a century in Wednesday's 1-0 win over Bayern Munich which plunged their troubled opponents even deeper into crisis.
Stung by a 3-0 humiliation at the hands of Bayer Leverkusen, Bayern Munich head to Lazio on Wednesday knowing only a deep run in Europe will salvage their season.