Bayern Munich have become embroiled in a row with city rivals 1860 Munich over their tenancy of the Allianz Arena.
The second division side are looking into the possibility of moving their home games away from the stadium they share with their more high-profile neighbours.
Bayern have already bailed out 1860 once by buying their joint share in the stadium venture last year and chairman Karl-Heinz Rummenigge is unhappy that they are now considering moving away.
"I have got to say, quite honestly and openly, that it is like in any rental agreement. If the tenant wants to move out of the flat, or in this case the stadium, then there are damages to pay," said Rummenigge.
"If 1860 Munich think they can simply move out without any consequences, then they are very naive.
"We have already accommodated them in a big way and our willingness to talk is exhausted.
"We learned about all this from the newspaper, which is also typical 1860 style. We are used to it."
Meanwhile, Hamburg coach Martin Jol has rejected suggestions that his side are not genuine title challengers and are only making up the numbers at the top of the Bundesliga.
The Dutch coach has led the club to second place behind Hertha Berlin with nine games to go, while they are one of the favourites to win the UEFA Cup after reaching the last eight.
Despite their success so far this season Jol's side are yet to convince some observers, but the former Tottenham manager believes they are genuine title contenders.
He said: "Of course we can win the league.
"We are still level with second place. We have won eight of our last 11 games, but things could have gone differently. There is a very thin dividing line."
Arminia Bielefeld have handed a trial to Didier Drogba's younger brother Joel.
The younger sibling of the Chelsea and Ivory Coast striker will spend a week training with the Bundesliga side in the hope of earning a permanent contract.
Joel started his career at French club Le Mans alongside his brother.
However, the nomadic striker has had spells in Switzerland, Belgium, France, England and most recently in Ukraine with Metalurg Donetsk.
Elsewhere, VfB Stuttgart midfielder Sami Khedira could miss the rest of the season following knee surgery.
The Germany Under-21 international has undergone an operation on a torn meniscus in his left knee and is facing at least four weeks on the sidelines.
Khedira was scheduled to play for the under-21s against Holland on Friday and Belarus next Tuesday.
However, he is now likely to be sidelined until the closing weeks of the season at the earliest.Reuse content