And the full-back stressed the Blues will not worry about the race to the Championship until after the showpiece against Sunderland.
Kenny Jackett’s men take on League One promotion rivals Black Cats for the right to claim silverware.
It's a distraction from the race for a top-two finish for both teams.
Portsmouth loan strategy revealed following duo's arrival from Ipswich and Blackpool respectively
Predicted Portsmouth XI v Cheltenham: changes expected to side that beat Cardiff so handsomely - but attacking duo could keep places and defender set to return
Cheltenham 0-1 Portsmouth LIVE: Bishop puts Blues ahead after testing first-half
Portsmouth boss Danny Cowley spells out why Blues can rival Sheffield Wednesday, Ipswich and Derby for promotion as he prepares for welcome return to Cheltenham
‘For the sake of 90 minutes football, it’s not worth a player being off work for a year or ending up in a wheelchair’ – Hampshire grassroots football clubs postpone matches due to the heatwave
Pompey moved above Sunderland and into third with a win at Shrewsbury last weekend.
But Brown is adamant Pompey will not worry about reaching the Championship until after Sunday.
He said: ‘It’s all about the next block of games but all we can do is focus on Sunday.
‘We’re focused fully on that and then we’ll take on the league after that.
‘We’ve come off the back of some good results in the league but they’re gone now.
‘It would have been frustrating (if we’d have dropped points at Shrewsbury) because we haven’t got a league game and other teams have got games.’
Pompey head into the Checkatrade Trophy final on the back of three successive League One wins.
And with a cup final along with the race for promotion hotting up, Brown believes the Blues’ confidence is growing.
He added: ‘Naturally, winning games builds confidence.
‘It builds moral and togetherness – winning football matches changes everything.
‘It’s more enjoyable throughout the week. Even as fans, it’s a better feeling you know you’re going into work on a Monday and your team has won.
‘It’s the same as players. Winning is everything and it doesn’t matter how you do at this stage of the season as long as you get the result.’
Check out our Checkatrade Trophy special in SATURDAY's Sports Mail
If you live outside the area or are unable to pick-up a copy, you can buy a copy by calling 033 0403 0066 which we'll then post out to you.