Borussia Dortmund boss Hans-Joachim Watzke and his colleagues will not have lunch with their Bayern Munich counterparts before Saturday's Bundesliga match, saying relations between the Champions League finalists had gone cold.
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Watzke admitted he had been irritated by the recent behaviour of Germany's biggest club who last week signed Dortmund's Mario Goetze.
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"I have always spoken about Bayern with great respect and admiration. But I must say now that things have cooled off a little," Watzke told reporters.
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"There have been a couple of irritations recently." Dortmund host Bayern on Saturday in a Bundesliga game which is effectively a friendly, with Bayern having already won the title and Dortmund assured of a Champions League place next season.
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The two arch-rivals meet again in the Champions League final in London on May 25.
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Watzke said there was still a working relationship between the clubs and added: "Everything should go off in a fair, sporting manner on Saturday but there will not be hugs all around like before.
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"Why should we act as if everything is hunky-dory?" added Watzke, who has been responsible for Dortmund's financial renaissance after the club appeared on the brink of collapse in 2005.
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"There won't be any lunch with Bayern, just a handshake," he said.
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Dortmund have won the Bundesliga in the last two seasons and also beat Bayern in last year's Cup final.
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Bayern have turned things around this season, knocking Dortmund out of the Cup and taking back the league.
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Last week, Dortmund announced that Goetze, one of their top players and a product of their youth academy, would be joining Bayern next season. Dortmund said pointedly that Bayern had never been in contact with them over the move.
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Previously, the two coaches had become entangled in a war of words in March.
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Dortmund's Juergen Klopp said Bayern were spending their way to success and were imitating other teams "a bit like what the Chinese do in industry."
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He later apologised but not before his opposite number Jupp Heynckes accused him of lacking dignity.