There will be plenty of friendly exchanges when Pompey arrive at the Ricoh Arena this evening.
Five former Blues players are currently employed by Coventry, although Conor Chaplin is not eligible to feature against his parent club.
However, Michael Doyle is likely to play against Pompey for the first time since leading them to the League Two title in 2017.
Tom Davies, Liam O’Brien and Dominic Hyam could also appear and Jack Whatmough has plenty of respect for his former team-mates.
The defender said: “I’ve spent many years with Conor and he’s a great lad who is really missed around the place, so it’ll be nice to catch up with him.
“He’s probably one of the best finishers I’ve played with, so hopefully he can kick-start his career at Coventry.
"In that group that got promoted, he was the older head and the person everyone listened to when he started talking."
“There are obviously a few old faces at Coventry, so I’m looking forward to seeing how they’ve been getting on.
“Michael has been at some big clubs in his career and captained all of them – you can see why sides still want him.
“He’s a massive character and has looked after himself to make sure he can still make an impact at the age of 37.
“In that group that got promoted, he was the older head and the person everyone listened to when he started talking.”
The friendly feelings are likely to disappear when the game starts, however, as Pompey look to maintain their unbeaten record.
Whatmough said: “We’re in a good position and have started the season really well, but it is still early doors and we have to keep it up.
“One defeat and it could all turn around, so we’ve got to keep kicking on and the important thing is where we are at the end.”