Charlton could have their biggest attendance of the season against Shrewsbury tonight.
The Addicks face the Shrews in the first leg of their play-off semi-final in SE7.
The Valley crowd was 17,581 in a 2-0 defeat to Paul Hurst’s men in February - and that figure is set to be surpassed.
The club is advising supporters to get to the ground early to avoid long queues.
A statement said: “The club is asking Charlton supporters who will be buying their home leg play-off tickets from the Valley on Thursday to arrive in SE7 as early as possible, in order to help reduce their queuing time in the lead up to kick-off.
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“Home sales have already exceeded the number of Charlton fans that attended our last SE7 game against Blackburn Rovers.
“It is anticipated that tonight’s walk-up (those buying on the day/night) could be three times as many than for a regular league game.
“Therefore, the club would ask Addicks fans, if possible, to purchase their tickets in the morning or early afternoon.”
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