Watford manager Walter Mazzarri has seen his squad affected by a fever before their FA Cup third-round match against Championship strugglers Burton.
Goalkeeper Heurelho Gomes and left-back Jose Holebas have been struck down by illness and will not play, but keeper Costel Pantilimon could be fit.
Burton boss Nigel Clough will give a late fitness test to John Brayford.
On-loan midfielder Luke Murphy, who arrived from Championship rivals Leeds United on Friday, is eligible to play.
Centre-back Ben Turner (hamstring) is not expected to be risked, while Jackson Irvine (groin) is also out.