Petersen is on loan at Bremen for the season and still has a contract until 2015 with Bayern, but he plans to be the man who brings an end to Bayern's perfect start.
"They don't need points in Bremen," he said. "They have not dropped any yet and that is not on.
"Maybe it is our turn tomorrow [Saturday]. Sooner or later, they will get caught out this season and I hope that the points stay in Bremen."
For that to happen, though, Petersen knows lots of contributing factors must all come together.
"You have got to take your hat off to the way in which they have strengthened their squad," added Petersen on his club's website.
"I hope that Bayern have an off day and we have a good day, and we have also got to be stable at the back, then we can do it."
Petersen's place in the starting XI is far from certain, though, since Joseph Akpala scored against Freiburg in midweek while the 23-year-old was given a break.
"I am pleased for Joseph because the goal was extremely important for the team and we are going to push each other to perform well in the coming weeks," added Petersen.
There is an equally intense battle for places in the Bayern team and their coach Jupp Heynckes is currently managing to keep everybody happy without disrupting his side's rhythm.
More rotation is likely with a view to the Champions League game against BATE Borisov next week, but this is something the players are used to.
"You can see that whoever comes in wants to perform," said Xherdan Shaqiri, one of the beneficiaries of the changes in midweek.
"It does not matter who plays for who, we are all first-team regulars."
A flu virus could make it easier for Heynckes to chop and change since Thomas Muller, Franck Ribery and Holger Badstuber all missed training sessions this week and could be natural candidates for a rest.