Pompey finished last week by reaching the third round of the Emirates FA Cup.
Now they will look to begin the latest one by securing a spot in the last 16 of the Checkatrade Trophy.
Having topped a group containing Tottenham U21s, Crawley and Gillingham, the Blues host Arsenal’s youngsters this evening.
And Joe Gallen believes the Gunners will have plenty of talent on display, despite a lack of experience.
Pompey’s assistant manager said: “It’s a massive club with a brilliant youth system, with plenty of talented players produced over the years.
“They’ll have a big budget for their academy and have the pick of guys from London and around the world.
"“It’s an exciting game for us and hopefully we can produce a positive performance to go through to the next round."
“Some of them have already appeared in Europe for Arsenal and we could be watching future international stars.
“We don’t know what sort of team they’ll put out, but we always try to make sure we’re organised and that everyone knows their job.
“It’s an exciting game for us and hopefully we can produce a positive performance to go through to the next round.
“When you get past the group stage, you do start to think that Wembley is not too far away and it’s always an honour to play there – in any competition.”
With Pompey’s FA Cup match at Spotland coming just a couple of days earlier, there will be changes to the team.
Gallen said: “It’s a tall order to play on Sunday and then Tuesday, so we’ll mix things up, while still abiding by the rules and regulations.
“We have guys who, for one reason or another, haven’t been able to break into the team and they’ll get an opportunity to stake a claim.”