Bayern Munich could move closer to an historic fourth straight German league title if they win at nearest-rivals Borussia Dortmund in four days, but Pep Guardiola says, for now, it's all about Mainz on Wednesday.

Bayern hold an eight point lead in the table and victory at Dortmund on Saturday would be a significant step becoming the first team to win four straight German league titles.

Bayern won 2-0 at Champions League side Wolfsburg last Saturday and now a mouth-watering showdown beckons in Dortmund.

Before that however Guardiola insists he is focused on playing resurgent Mainz at Munich's Allianz Arena.

"Everyone is talking about Wolfsburg and Borussia Dortmund, but we are playing against Mainz, who are fifth in the table.

"They are a strong and dynamic team."

The Martin Schmidt-coached Mainz proved just how strong they are in beating Bayer Leverkusen 3-1 at home on Sunday with goal-scoring midfielder Yunus Malli netting twice to leave them fifth and challenging for a Champions League place next season.

But Bayern want to secure the league title as soon as possible to allow them to focus on Europe.

They set the Bundesliga record for the earliest title win two years ago by wrapping things up with seven games left at the end of March 2014, holding a 22-point gap over second-placed Dortmund at the time.

Two years on, Dortmund are making life much harder under coach Thomas Tuchel and Guardiola knows he can ill afford to be distracted by the Champions League or German Cup in his final few months in Munich before coaching Manchester City next season.

Tuchel says it is obvious Bayern are eager to win at Dortmund to leave Borussia with only a mathematical chance of winning the title.

"It should be noted that Bayern want to decide things early," said Tuchel, ahead of their game on Wednesday's at Darmstadt, who are just above the relegation places.

"Perhaps it's the best outcome (for Bayern) if the eight point gap remains."

Injuries have robbed Guardiola of defenders with centre-backs Jerome Boateng, Javi Martinez and Holger Badstuber sidelined.

But in attack, he has all his players fit and is struggling to find a place for Germany's World Cup winner Mario Goetze, who is back from injury.

"He still needs more time and I have seven forwards fit," said Guardiola.

"We still have three months left and we need all our players in order to reach our goals.

"Mario is very professional and is important for us."

After ex-Bayern president Uli Hoeness was released from prison after serving 21 months for tax evasion on Monday, Guardiola was tight-lipped on whether he has already spoken to him.

"That's private," Guardiola snapped.

"We are happy for him, for Susi (Hoeness' wife) and his family."