Bayern Munich CEO Karl-Heinz Rummenigge says he is "deeply ashamed" of the banners unfurled by his side's supporters in Saturday's 6-0 win over Hoffenheim.
The match was stopped several times because away fans unveiled signs insulting Hoffenheim owner Dietmar Hopp, who has been a controversial figure among Bundesliga supporters since bankrolling the club’s rise to the German top-flight.
The referee took the teams off the field, while Bayern coach Hansi Flick and some players fumed at the supporters and urged them to stop their protests.
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After concerns that the game could be abandoned, the teams returned to finish the match, but spent the remainder casually passing the ball around.