Goals from Leeds’ Sam Greenwood, Manchester City’s James McAtee and Blackburn’s Tyryhs Dolan secured the win for the Young Lions.
It has been revealed that the Blues boss travelled to Colchester to watch Andy Edwards’ side as part of his summer scouting mission.
Cowley was at the game to eye potential loans from Premier League outfits who could have an impact similar to Gavin Bazunu.
The break enabled the former Lincoln boss to step up his scouting roles with a host of games on his busy schedule.
We’ve taken a look at the Young Lions to see who the players who could arrive at Pompey moving forward.
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13. Kaine Kesler-Hayden
The right-back started the season at Swindon, impressing in his first loan move away from Villa Park. After 21 appearances for the Robins, he was recalled in January and made the step up to League One. He has since continued his fine form with MK Dons notching up nine appearances for Liam Manning’s side. With Kieron Freeman the only right sided full-back contracted at Pompey for next season, the 19-year-old could eye another season in League One to further his development. Photo: Pete Norton
14. Tyler Morton
The centre midfielder has managed to star in nine first team games for Liverpool, two of which came in the Champions League. The 20-year-old has been a key part in the Reds’ under-23's side this season, having an influential role in the middle of the park in the EFL Trophy as well as the Premier League 2, where he has a total of 19 appearances. With two Champions League outings under his belt, League One might be a too far step down for Morton who is already in Jurgen Klopp’s plans. Photo: John Powell
15. Aji Alese
The left-footed centre back is currently going about his trade with West Ham. The 21-year-old has gained quite a reputation with the Irons being earmarked to be the next youngster to burst onto the scene at the London Stadium. He’s played 23 times for West Ham’s under-23's side this season in both the Premier League 2 and EFL Trophy. Alese made 15 appearances for Accrington in League One in the 2019-20 season and also made two outings for Cambridge last term. Photo: WILL OLIVER
16. Luke Plange
The 19-year-old recently joined Crystal Palace after impressing in his debut season in first team football. Despite joining Palace from Derby in January, the striker returned to Pride Park following his move and has scored three goals in 21 outings. A return to the Championship could be on the cards next term with the forward potentially being an already established secon-tier striker. Photo: Tony Marshall