Crystal Palace have signed striker Kwesi Appiah from Margate and defender Michael Chambers from Dulwich Hamlet for undisclosed fees.
Appiah, 21, whose deal is yet to be approved by the Football League, and Chambers, 17, have both agreed two-and-a-half year deals with the Eagles.
Meanwhile, defender Paul McShane and striker Chris Martin have extended their loans until the summer
McShane, 26, has made three appearances since his move from Hull this month.
Norwich City frontman Martin, 23, has netted three times in 12 games during his two months at Selhurst Park.