Västerås now wants to investigate which of the newly added members are actually VSK supporters and review which priority rules should apply.
The match is the final round of the football league and could be decisive for Hammarby in the race for the Swedish Championship. The 2,000 tickets allocated to Hammarby sold out immediately.
Those who became members after November 6 will not receive priority, but will be offered a refund of their membership fee.
Västerås will announce the exact time of the new ticket release later.
Hammarby leads the league with two rounds remaining and is chasing its second Swedish Championship title. The club's first and only title came in 2001.
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