The club signed Andre Blackman on a one-year deal. The 25-year-old played already for AFC Wimbledon and Celtic.
Crawley coach Dermot Drummy said the SKy Bet League Two club's official website:
"Andre really impressed me on his full debut, he kicked on from there and he looked very good physically.
"He can play at a higher level too, and we're really pleased with that mentality".