Manager John Mousinho has led the team to this success in League One after taking over from Danny Cowley mid-season.
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Club owner Michael Eisner tweeted: "Congratulations to all of Pompey! From the players to all of the staff to the fans - what an accomplishment to celebrate with the city of Portsmouth!
"Congrats to Andrew Cullen, Rich Hughes and John Mousinho for putting together a super group of footballers. That has made all the difference."