Brentford defender Ben Mee is out for the season after fracturing his ankle at West Ham on Monday.
Aaron Hickey, who has not played since October, has had a setback in his recovery from a hamstring injury.
Chelsea hope Thiago Silva will be fit after a groin injury and Marc Cucurella also faces a late fitness test.
Christopher Nkunku faces a few more weeks out with Benoit Badiashile and Romeo Lavia among those also still sidelined.
MATCH FACTS
Head-to-head
- Brentford are unbeaten in their last four league games against Chelsea (W3, L1).