Crystal Palace manager Peter Taylor has signed winger Dave Martin from non-league side Dartford on a two-and-a-half-year contract.
Martin steps up from Ryman D1 South to the Championship
The Ryman Division One South side will receive a fee of around £25,000 for the 21-year-old.
"Dave's trained with us on a number of occasions and is an out-and-out left winger, which is what I've been looking for," Taylor explained.
Martin joined Dartford from Kent League side Slade Green in the summer of 2005.