More than 44,000 Southampton fans will back the team in the Johnstone's Paint Trophy final after the club sold their full allocation.
The Saints will go head-to-head against League One rivals Carlisle at Wembley on March 28 and there will not be a spare seat in their half of the national stadium.
Alan Pardew's men will be supported by twice as many fans for the game after it emerged that the Cumbrians are only expected to take around 22,000 supporters to the capital for the clash.