St Pauli face playing their next home game behind closed doors after crowd trouble led to last Friday's game with Schalke being abandoned.
The German Football Association's supervisory committee has recommended their Bundesliga clash with Werder Bremen at the Millerntor-Stadion on April 23 be played in an empty stadium.
Their game against Schalke was abandoned by referee Deniz Aytekin in the 87th minute with the Royal Blues leading 2-0 when assistant referee Thorsten Schiffner was hit by a full cup of beer thrown from the stands.
In a statement from the German FA (DFB) on Thursday, the supervisory committee accused St Pauli of "a lack of protection for the assistant referee and continued unsporting behaviour."
The statement said a lighter was also thrown towards Schiffner in the first half and coins in the direction of the other assistant Holger Henschel in the second.
The DFB's sporting court will rule on the case on Friday.
St Pauli claimed the proposed punishment was too harsh and appealed for a lesser penalty. The club said in a statement a fine would be appropriate.
President Stefan Orth told the club's website: "We can not and will not accept the penalty lying down. We will try with the DFB to find a solution that avoids a ghost game at the Millerntor.
Director of sport Helmut Schulte added: "We don't agree with the punishment because it is a legitimate right of a club to voice their opinion and ask for a lesser penalty.
"We hope for understanding of our position, because no club can prevent what happened 100%."
Head coach Holger Stanislawski said: "It would be regrettable if we had to go into such an important game without our supporters."
The DFB have already awarded Schalke a 2-0 victory in the match.
St Pauli lie second bottom of the Bundesliga table, two points from safety.