Reading are unchanged from their 0-0 Boxing Day draw with Swansea, Pavel Pogrebnyak continuing as the lone striker but with Adam Le Fondre and Hal Robson-Kanu on the bench.
There is no place for Jason Roberts in the squad, though.
Federici; Gunter, Pearce, Mariappa, Harte; Kebe, Leigertwood, Guthrie, Karacan, McAnuff; Pogrebnyak
Subs: Taylor, Cummings, Morrison, Tabb, Robson-Kanu, Le Fondre, Hunt
West Ham boss Sam Allardyce received a welcome boost with the FA rescinding Carlton Cole's red card from the clash with Everton - the striker starts this afternoon.
Elsewhere, like the Royals, the visitors are also unchanged from their last game, however Ricardo Vaz Te does return to make the bench.
Jaaskelainen; Tomkins, Reid, Collins, O'Brien; Taylor, Noble, O'Neil, Jarvis; Nolan; Cole
Subs: Spiegel, Demel, Spence, Diarra, Collison, Vaz Te, Maiga