The 21-year-old defender has signed a one-year deal with the club after joining from NIFL Premiership side Larne.
Crystal Palace have completed the signing of Academy player Kofi Balmer from Larne F.C.
He made over 40 appearances across all competitions in their successful 2021/22 campaign, which saw them secure a Europa Conference League play-off spot.
Prior to playing for Larne, Balmer featured heavily for Ballymena United. He became a mainstay in the team after making his debut at 16 years old in the 2016/17 season, and helped them finish runners-up in the 2018/19 Northern Ireland Premiership.
Balmer has also made 17 appearances at international level for Northern Ireland Under-19s and Under-21s.
He said: "It's surreal. I feel amazing. It's every boy's dream to play football professionally, but to come to a club like Crystal Palace with all the top quality facilities – I couldn't have asked for anything better."
Commenting on the new signing, Academy Director Gary Issott said: “We are delighted to welcome Kofi to the club.
“He fits the profile of young, hungry and talented players that we want at the club and he has already amassed a wealth of experience in Northern Ireland for both Larne and Ballymena.
“He joins a talented U21s squad and will provide stiff competition in the defensive area of the team.”
Football Dreams: The Academy, a documentary about the Palace Academy, airs from 21:00 on Thursday, 11th August in the UK only. Find out more here.