Harry Jewitt-White has signed his first professional contact with Pompey.
The Welsh under-18 international midfielder recently turned 18 and has been on the bench for several League One matches this season.
His five senior appearances have all come in the Papa John’s Trophy, including in January’s dramatic victory at Exeter.
Jewitt-White said: “I’m delighted because Pompey is where I’m from and they’re the club that I grew up supporting. I’m really happy.
"It’s been an unbelievable experience to have been around the first team and it’s made me want more. I’m looking forward to what lies ahead."
“Now I need to keep working hard if I want to kick on and do enough to earn my place in the side next season.
“It’s been an unbelievable experience to have been around the first team and it’s made me want more. I’m looking forward to what lies ahead.
“I want to thank all the academy staff, but especially Jon Slater and Shaun North, who have been with me since I joined the club at the age of eight.
“Everyone has helped me get to this point, though, including Liam Daish and Greg Miller. They’ve all been unbelievable.”