The Blues achieved unlikely progression from Southern Group B as George Hirst’s injury-time strike forced a four goal swing that allowed the club to leapfrog AFC Wimbledon and Crystal Palace under-21s into second position.
And by doing so, they join a number of League One and development teams in the bookies reckoning to win the competition.
Rivals such as Sunderland, Sheffield Wednesday, Ipswich and Bolton also qualified for the round-of-32, albeit in more comfortable fashion than Danny Cowley’s side.
As a result, we’ve compiled a list on the favourites to find success at Wembley thanks to SkyBet’s odds.
Click through the list to see where Pompey rank.
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13. Chelsea U21 - 16/1
Southern Group E position: 1st Wins: 1 Draws: 2 Losses: 0 Photo by Alex Burstow/Getty Images) Photo: Alex Burstow
14. Lincoln City - 14/1
Northern Group F position: 2nd Wins: 2 Draws: 0 Losses: 1 (Photo by George Wood/Getty Images) Photo: George Wood
15. Charlton Athletic - 14/1
Southern Group G position: 2nd Wins: 2 Draws: 0 Losses: 1 (Photo by Jacques Feeney/Getty Images) Photo: Jacques Feeney
16. Bolton Wanderers 14/1
Northern Group D position: 1st Wins: 3 Draws: 0 Losses: 0 (Photo by Lewis Storey/Getty Images) Photo: Lewis Storey