Lawrie Sanchez paid tribute to his Carling Cup giantkillers after their Fratton Park upset.
Barnet stayed in the Football League on the final day of last season.
Just two games later, they inflicted a 1-0 defeat on Championship Pompey.
The League Two side deserved the victory, with Mark Hughes heading the winner.
Sanchez knows all about upsets, having netted the winning FA Cup final goal for Wimbledon against Liverpool in 1988.
And he praised his Barnet side who pulled off last night’s Carling Cup shock.
He said: ‘We were talking on the bench about whether we had the belief to see it through.
‘The majority of players featured against Port Vale at the end of last season.
‘They were in a scrap where livelihoods, jobs, careers depended on it, not just for them but people at the club.
‘But they were up to it and the Portsmouth performance reinforces it.
‘It is nothing new. I know this group of players have plenty of heart and will give everything they have got.
‘I think the controlling way we finished the game showed they have added to that heart a little bit more game craft.
‘Certainly towards the end we were the ones looking like getting a second goal rather than them.
‘I thought we were excellent.
‘We had great opportunities, scored a great goal, had one disallowed and had three one-on-ones with the keeper. You can’t ask for more from your team.
‘How Portsmouth played is Steve Cotterill’s worry, not mine.
‘Mine is about how my team played and I am very pleased.’
And Sanchez has no preference who his side face in the next round.
He added: ‘With the greatest of respect, I don’t think we can win the Carling Cup but we would like to go a fair way and hopefully fill the coffers.
‘This squad is great but we could do with one or two more.’