Left-back Ben Davies, midfielders Kurtis March and Jordan Smith as well as winger Gwion Edwards have all been handed one-year deals having helped win the FAW Welsh Youth Cup.
Head of youth Tony Pennock told City`s official website: "I'm pleased for the four boys. They deserve to make the step up and I'm sure they will continue to work hard as young pros because they`ve still got a long way to go.
"Unfortunately, the worst part of my job was releasing four other lads. While they are obviously disappointed, they should be proud of their achievements."