The Blues appeared to be heading out with a 1-0 defeat at Wessex League Division One side Folland Sports in the third round of the competition.
But substitute Harry Clout took the fixture to penalties following a leveller two minutes into time added-on.
Unfortunately the Blues subsequently lost out 5-4 on spot-kicks, but it was still a brave display – and here are our Pompey player ratings...
13. Harry Clout - 7
(Replaced Jayden Keteku on 71 minutes) Big impact when he came on, taking match into extra-time with a dramatic leveller two minutes into time added. Also scored in penalty shoot-out - and shushed the home support. Photo: Jason Brown
4 / 4