Watford make one change to the staring XI against Swansea City as Brendan Rodgers returns to Vicarage Road for the first time as an opposing manager.
Andrew Taylor is back after being ineligible to face his parent club Middlesbrough on Saturday as Lloyd Doyley switches to right back and Lee Hodson drops to the bench.
Dale Bennett is the only noticeable absentee with injury as Mackay makes just one change to the 18-man matchday squad, with Matthew Whichelow missing out.
Swansea City make three changes to their starting line-up as Darren Pratley and David Cotterill miss out through injury and Frank Nouble is dropped.
Former Chelsea starlet Scott Sinclair and Stephen Dobbie are back from injury and Albert Serran also comes into the starting XI.
Watford: Loach; Doyley, Mariappa, M Taylor, A Taylor; Eustace, Cowie, Mutch, Buckley; Sordell, Graham.
Subs: Gilmartin, Hodson, Oshodi, Walker, McGinn, Bryan, Deeney.
Swansea: De Vries; Tate, Monk, Serran, N Taylor; Williams, Allen, Gower; Dyer, Sinclair, Dobbie.
Subs: Makabu-Makalambay, Rangel, Orlandi, Van der Gun, Lopez, Nouble, Beattie.
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