Aston Villa v C Palace
Villa captain Stiliyan Petrov, whose late equaliser at Selhurst Park 10 days ago forced tonight's replay, is a doubt for Martin O'Neill's side after picking up a virus. Gabriel Agbonlahor (calf) and James Collins (head) could feature after picking up knocks at the weekend. For the visitors, midfielder Neil Danns (back) will have a fitness test, while winger Sean Scannell is struggling with a groin problem. Stern John, Kieron Cadogan and Lee Hills are all cup-tied, so manager Neil Warnock could struggle to fill his bench.
Stoke v Manchester City
Potters midfielder Matt Etherington could make a surprise return just 11 days after suffering suspected knee ligament damage in the original tie at Eastlands. Abdoulaye Faye and Andy Wilkinson are suspended, although Danny Higginbotham (back) could return. City striker Carlos Tevez misses out again on compassionate grounds, while Adam Johnson is cup-tied. Patrick Vieira is suspended after kicking Glenn Whelan in last week's league match with Stoke, while Martin Petrov (knee) is a doubt.
Tottenham v Bolton
Spurs manager Harry Redknapp is missing Ledley King after the centre-back tore a thigh muscle in Sunday's win at Wigan. Aaron Lennon [groin] remains out after complications in his recovery, while Younes Kaboul and Kyle Walker are ineligible. Trotters manager Owen Coyle could field a number of fringe players with Vladimir Weiss and Jack Wilshere cup-tied and Mark Davies, Chris Basham and Gretar Steinsson all injury doubts. Ivan Klasnic may start as he continues his recovery from a calf injury.
West Brom v Reading
Baggies midfielder James Morrison could make a first appearance in 10 months for the hosts after recovering from a heel injury. Marek Cech [hamstring] returns, although Ben Watson and Frank Nouble are cup-tied, while Jerome Thomas is suspended. Ivar Ingimarsson returns for the Royals after overcoming a virus. He replaces cup-tied Zurab Khizanishvili for the visitors, although Shane Long is suspended. Brynjar Gunnarsson, Simon Church and Grzegorz Rasiak may all feature.