Joe Morrell has enjoyed leading table-topping Pompey through an unbeaten October.
The Wales international has skippered the side in the absence of the injured Marlon Pack and impressed with his performances.
He will now be hoping to continue the winning run into the start of a new month, with the Blues visiting Chesterfield in the FA Cup this weekend.
And ahead of that first round contest, Morrell is happy with his own personal displays in the middle of the park
The midfielder said: “I’m always hesitant to say that I’m playing well, but it’s certainly one of the best spells I’ve had.
“As you get older, you become a better player and I am probably coming towards my prime. I’ve learnt a lot of things over the years.
“A lot of it comes down to being part of a fantastic group of players, with a manager and style of play that really suits me.
"I’m always hesitant to say that I’m playing well, but it’s certainly one of the best spells I’ve had."
“It’s been an honour to wear the armband and a proud moment – everyone knows how special this club is and what it means to me.
“We’ve got a fairly young team and with Marlon out, there’s a bit more responsibility to drive standards.
“The fact we’ve been able to pick up some points without him just shows the depth that’s in our squad. “
Standing between Pompey and a place in the second round are a Spireites side sitting at the National League summit.
Morrell said: “I’ve never really done too much in the competition, although going to Spurs last season was fantastic.
“We know that Sunday is one of the worst draws we could have got because they’re not really a non-league team and they certainly don’t have a non-league manager.
“It will be a tough one for us and we’re treating it as if we’re facing a League One side because we know about the quality they’ve got.
“There are guys who have played here in the past and we definitely won’t be underestimating Chesterfield on Sunday.”