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Gillingham fans are being urged to purchase their tickets for Saturday's derby at Charlton.
The Gills have already sold around 2,700 tickets for the League 1 clash.
Remaining tickets are on sale from the box office at Priestfield until midday on Thursday although if seats remain then Gills supporters can still pay on the day at The Valley, subject to availability.
It will be the second meeting between the two sides this season. They drew 1-1 at Priestfield in October when Simeon Jackson's equaliser cancelled out a John Nutter own goal.