Prince Buaben also misses out with a thigh problem, while Fitz Hall and Alex Geijo have come back into contention following their spell on the sidelines.
Theo Robinson may have earned himself a place in the starting lineup with his equaliser against Wolverhampton Wanderers last week.
Derby: Fielding; Brayford, Roberts, Buxton, Keogh; Bryson, Coutts, Hendricks, Hughes; Robinson, Sammon
Watford: Almunia; Taylor, Doyley, Nosworthy, Yeates; Hogg, Murray , Pudil, Abdi; Iwelumo, Vydra
Sports Mole says: 2-2