Alex Bass heads the Academy products handed professional deals at Pompey.
The goalkeeper, who has been a regular on Paul Cook’s bench this season, has been rewarded for his progress with Mark Kelly’s set-up.
As earlier revealed by The News, Academy skipper Calvin Davies has also been given a 12-month contract.
Completing the trio is midfielder Christian Oxlade-Chamberlain, son of former Pompey favourite Mark Chamberlain.
In addition, defender Dory Yates will remain for an additional six months, giving the club longer to assess him following an injury-hampered campaign.
Leaving Fratton Park will be Kaleem Haitham, Brandon Joseph-Buadi and Liam Sayers.
Adam May signed professional terms in August.