Southend United boss Chris Powell was thrilled to make Sam Barratt a Blues player and is looking forward to seeing him develop at the club.
Barratt joined from Maidenhead United and signed a one-year deal with the option of a second to make the jump into the Football League.
He has also played twice for England C, but will now join up with Blues when they report for pre-season at the end of June.
Boss Powell said: “He’s a player we’ve watched extensively throughout the second half of last season since I came into the club.
“We heard good things so we kept an eye on him and how he was doing and we felt it was the right time for us to act.
“He’s a player that has been on the radar of a number of clubs at all levels.
“I wish him well because I feel he’s got all the attributes to do well at this level.”
Powell added: “He’s an unorthodox winger, if I can put it that way, in that he’s tall, and most wingers are normally very small.
“He’s got a wonderful left foot, he’s a good crosser of the ball, likes to shoot and take players on, he can score goals with his head and can play off the left, off the right or centrally.
“He’ll have pre-season with us which will be really good not only to get to know his qualities as a player but as a character and fitting in with us, but we’ve heard good things in that respect.
“He’s at an age where he can only develop with us and how we’re trying to move forward as a team and I think he will just add another dimension to the squad.”