Palace youngsters Jake Gray and Ryan Inniss have both signed new contracts with the club.
Gray broke into the Eagles first-team last season by making two appearances in the Capital One Cup games against Walsall and Newcastle United, and the 19-year-old winger has been rewarded with a new two year contract at Selhurst Park as he aims to make a mark in Alan Pardew's side this season.
Inniss, 20, has yet to play a competitive game for Palace but has been sent out on loan to the likes of Cheltenham Town, Gillingham, Yeovil Town and Port Vale to gain experience in the Football League, and has been a regular alongside Gray for the under-21s in recent seasons. He has put pen to paper on a three year deal.
Meanwhile academy graduate Aaron Wan-Bissaka has also signed a three year professional contract after impressing for both the under-18s and development sides last season - playing three times and scoring once for Gary Issott's men.
The development manager's squad has also been bolstered with the capture of 19-year-old goalkeeper Kleton Perntreou who was recently released by Hibernian. The Albanian-born Greek shot-stopper played twice for the Hibees in the Scottish Championship last season having previously played for Bristol City's youth sides, and he has signed on for a year at the Eagles.