Cardiff were knocked off top spot after their 3-1 defeat away to Nottingham Forest on Saturday, with Leicester City taking over on goal-difference.
Watford made it three wins from four with their 1-0 win at home to Peterborough on Saturday, lifting them to 13th in the table.
Despite Saturday's defeat, Cardiff manager Malky Mackay is likely to stick with a similar lineup that has seen his side impress at the top of the league.
Possible starting lineups:
Cardiff: Marshall; McNaughton, Hudson, Connolly, Taylor; Conway, Whittingham, Cowie, Gunnarsson, Smith; Helguson
Watford: Almunia; Hall, Doyley, Hoben; Hogg, Pudil, Abdi, Cassetti, Chalobah; Deeney, Vydra
Sports Mole says: 2-0