Brentford have been assessing captain John Egan in the build-up to Tuesday's Sky Bet Championship home clash with Derby.
The defender went off early on in the 3-0 win at Bolton on Saturday having sustained a head injury.
The Bees are set to once again be without Sergi Canos and Lasse Vibe, who have been sidelined by ankle and foot problems respectively.
And Lewis Macleod is not yet ready for a return to action as he continues his recovery from a knee injury.
Derby are monitoring Tom Lawrence and Curtis...