The young full-back, who moved to Griffin Park from Arsenal last month, made his debut in Saturday's 1-1 draw with Shrewsbury but was forced off early in the second half with a dead leg.
Defender Dean played the full 90 minutes after a month out with a groin problem and midfielder Forshaw made his comeback from a calf injury as a substitute for Yennaris and could be in line to start.
Dannie Bulman could make his return on the bench when Crawley head to leaders Brentford.
Bulman suffered a fractured cheekbone against MK Dons on Boxing Day, but he hopes to get the green light to be involved at Griffin Park.
Fellow midfielder Andy Drury has shaken off a groin niggle and recent signing Gary Dicker could make his full debut, while goalkeeper Ross Atkins will be on the bench after joining on loan from Derby because Johnny Maddison is suffering from suspected appendicitis.
Since their last outing Crawley have let midfielder Nicky Adams join Rotherham, Gary Alexander moved to Burton and fellow striker Emile Sinclair was loaned to Northampton.
- Sports & Recreation
- Adam Forshaw
- Harlee Dean
- Dannie Bulman