A slow start was perhaps to be expected with Pompey making nine changes to their starting line-up against Northampton.
But they recovered from falling behind to secure a 2-1 victory at Fratton Park, with Leon Maloney and Marcus Harness netting either side of the break in the Leasing.com Trophy.
The former scored his first senior goal for the club with a header, while the latter found the target with a stunning volley.
And Kenny Jackett was pleased to see his side bounce back from their poor start to ultimately sail comfortably through to the third round.
The Blues boss said: “Northampton started better than us. We looked a bit hesitant, rusty and nervous – the first 20 minutes belonged to them and they deservedly took the lead.
“It seemed like it was going to be a long night for us, but credit to our players for digging deep and sticking at it.
"We’ve got a consistent and committed bunch here. There were some performances that we’re very pleased with."
“The remainder of the first half belonged to us and we got the equaliser. I’m really pleased for Leon to get his first goal.
“We were dominant after the break and really should have put the game to bed by scoring a few more.
“It took some excellent saves from their goalkeeper to keep it at 2-1, but we’re through in the competition and winning is a nice habit to get into.
“We’ve got a consistent and committed bunch here. There were some performances that we’re very pleased with.”
Ross McCrorie made his first appearance in almost a month, with Pompey’s treatment room beginning to clear.
Jackett said: “Ross came back from a hamstring injury, so there’s always a risk, but we got an hour out of him and that’s good news.
“We’re approaching having a fully-fit squad now and that’s crucial because there are massive games coming up and you need both competition and cover.”