Pompey have sold their entire allocation of tickets for the forthcoming League One match at Cheltenham.
It means that Danny Cowley's side will be backed by 1,400 supporters at Whaddon Road on Saturday, April 9 (3pm kick-off).
Fans who have purchased concession tickets are advised to bring proof of age identification with them to the game.
Official coach travel is still available and can be booked online through Lucetts Travel.
Tickets are still available for the the rearranged trip to Bolton and can be bought online here.