A Bayern Munich supporters' group has accused club president Uli Hoeness of exploiting away fans and breaking German Football League (DFL) regulations to do so.
Fan group Munich's Red Pride hit out at their club during the Bundesliga win over Cologne, displaying a banner that depicted Hoeness milking away fans.
Another banner referenced a Hoeness quote from 2012 in which he criticised ticket prices for the Champions League final at the Allianz Arena and said he did "not regard the fans as cash cows."
Munich's Red Pride claimed Bayern had acted against regulations by reducing the allocation of the cheapest tickets for away fans by 401 from 1,593 to 1,192.
DFL rules say Bundesliga clubs must offer away fans an allocation of 10 percent of the cheapest tickets sold to home fans.
Bayern's Allianz Arena has a standing capacity of 15,930 for home fans and, while it has no away standing, the club still have to offer 1,593 lowest category tickets to away fans.
Munich's Red Pride said Bayern had not done so, and another banner read: "Away fans rip-off. 401*€20 per match."
Similar protests had been staged at a match against Freiburg in October.
Last month, Bayern's independent fan group Club #12 protested against high ticket prices in the Champions League during their game at Anderlecht by throwing fake money onto the pitch.
UEFA fined Bayern €20,000 for "throwing of objects" and an "illicit banner."