Bayern Munich vs Hoffenheim - Hoffenheim seek upset after troubling week for Bayern

Top plays second-bottom in the Bundesliga on Sunday with Hoffenheim sensing their chance to cause an upset after a testing few days for Bayern Munich.

There have been reports of a bad atmosphere within Bayern, leaked by an unknown mole within the dressing room, and the injury of Jerome Boateng has left coach Pep Guardiola one key defender down.

He was not even given the chance to talk about that game at his pre-match press conference on Friday, however, with the media keen on just one thing: finding out who the mole is.

"How am I supposed to know?" Guardiola said. "Who is this anonymous player? Where does 'anonymous' play?

"Whether here, in Timbuktu, in Africa, in Australia - anywhere, if a player is not playing, he is a bit sad, but that is totally normal.

"We beat Hamburg, and you don't win games if the atmosphere is bad. Where is the problem?"

Guardiola will nevertheless find something of a problem when he names his starting XI, with just Holger Badstuber and Javi Martinez available as learned central defenders.

Medhi Benatia is also on the road to recovery and Guardiola does not want Boateng's injury to become an excuse.

"Martinez and Benatia have lots of qualities which Boateng doesn't have," he said.

"But of course I wonder whether we did everything right to prevent Jerome getting this injury.

"It was not possible (to prevent). But we've still got Rafinha, who can play in the back three, or David Alaba."

And to the suggestions that Guardiola's training has caused the numerous injuries, there was a shrug of disagreement from the Catalan.

"We're doing absolutely everything for the players," he said. "We talk to them about how important nutrition and sleep is.

"If you don't do that, then you can't win thousands of millions of titles, but this is football - these things happen from time to time."

Hoffenheim coach Huub Stevens played down the loss of Boateng, saying: "I don't think the loss of Jerome Boateng will make any difference. They've got a good replacement in Martinez."

Stevens insisted his lowly side had reason for optimism as they headed into Sunday's match, despite the fact Bayern have lost just one game all season and started 2016 where they left off 2015 - with a 2-1 win over Hamburg last weekend.

"We'll have 11 men against Bayern like in any other game, and I've always enjoyed meeting the top clubs," said the Dutchman, who side took a point off Bayer Leverkusen last weekend but still went into the weekend level on 14 points with bottom-of-the-table Hannover.

"My lads have trained well again this week and we will see on Sunday in Munich whether that is enough to get something."