Ian Woan today warned Pompey: Beware of your old boys.
Michael Appleton marks his first game as manager on Saturday with a trip to Watford.
He’ll come up against a Hornets side containing ex-Blues loanees Carl Dickinson and Jonathan Hogg.
The duo struggled to consistently impress during their spells on the south coast last season.
Left-back Dickinson made 39 appearances on-loan from Stoke, yet failed to win over the fans.
As for Hogg, the Aston Villa midfielder featured 19 times but faded badly after a bright start.
The pair both became summer signings for new Watford boss Sean Dyche.
He was also joined at Vicarage Road by Pompey first-team coach Woan, who took the role of assistant manager.
Woan insists the pair have been outstanding for the Hornets, establishing themselves as key performers.
And he believes their displays may surprise those Pompey fans who watched them last term.
He said: ‘Dicko and Hoggy have been outstanding since they came in.
‘Dicko had a tough time at Portsmouth, mainly because of injuries.
‘He got them at key times and never got himself fully fit to show what he could do.
‘Every time he got himself to a really good stage there was a niggle.
‘It may have only lasted 10 or 14 days but you have to come back from that.
‘That coincided with Hermann Hreidarsson coming to the fore and being fit. As everyone at Portsmouth knows, he is a tough man to shift once he gets in.
‘Dicko never got the chance to win over the fans. He’s won them over at Watford, though – they love him there.
‘Hoggy is one of the fittest players I have ever worked with and has a great attitude.
‘He got thrown in at Pompey last year.
‘He was still young and was just 11 matches into his career.
‘At his age you are not going to get performances week in, week out.
‘At Watford, though, he has been a revelation.
‘I am sure they are both looking forward to this game. They have been excellent signings for Watford – they don’t have points to prove on Saturday.’
Watford are currently just one place off the relegation zone.
But they are only three points behind Pompey.
Woan spent four years at Fratton Park, rising from youth team coach to first-team coach.
He has fond memories of those times but is enjoying life at Vicarage Road.
He added: ‘I am looking forward to the game.
‘I have a lot of good friends there and keep in touch with a few.
‘Watford are a really friendly club with a lot of good people, very similar to Pompey in that respect.
‘Although, we are poles apart as far as budgets are concerned!’