Guardiola previously rewarded his players with a trip to the festival itself during his time in charge, with players again donning traditional Bavarian clothing for the event.
While the likes of teenage Portuguese midfielder Renato Sanches experienced the photocall for the first time, Bavaria natives Muller and Philipp Lahm are old pros when it comes to the folk festival.
Oktoberfest starts on Saturday, with Bayern at home to Ingolstadt in the Bundesliga that same day.
Ancelotti had every reason to smile as he posed with his glass of beer, given he has won all five of his games in charge of the club without conceding a goal.
In their latest victory, Joshua Kimmich scored twice as Lewandowski, Ribery and Juan Bernat also found the net in Tuesday night's win over Rostov, helping Bayern get their European campaign off to a dream start.
Ancelotti is not getting carried away, though, despite being confident his side have the ability to challenge for Champions League victory this season.
'I'm happy, we made a good start,' Ancelotti told Sky.
'Win the Champions League? Sure it is possible, our team will be competitive this season, and for the moment everything is fine, but the first objective is to win the group, then we will see the draw.
'It was a great game. We opened the scoring early and then the game was more open for us.
'He (Kimmich) is in a very good shape, he's on a really good run and he's staying focused. But I have a very good team and it is difficult to compose a starting line-up.'
