West Ham United manager Sam Allardyce will be without defender James Collins for the trip to Bristol City in the FA Cup fourth round.

The Welsh international is suffering with a back problem picked up in last weekend's 3-0 victory over Hull City, leaving one of Joey O'Brien or Winston Reid in line to replace him.

Allardyce is expected to name a strong lineup for the trip to Ashton Gate, but one alteration could be winger Morgan Amalfitano who made a goal-scoring impact from the bench last week.

The Hammers are unbeaten in their last five games, but four of those matches - including both games in the previous round with Everton - have ended in draws after normal time.

Bristol City boss Steve Cotterill will be hoping to transfer the club's home form in the league to Sunday's cup clash after suffering just one defeat on their own patch in League One since August.

The Robins are also unbeaten in seven fixtures in all competitions, which have included clean sheets in the last three games, and those displays have helped the South-West outfit to second place in their division.

Defender James Tavernier, who is on loan from Wigan Athletic, is cup-tied, but Aaron Wilbraham and Kieran Agard could be included in the squad after injury.

Bristol City:

Form in FA Cup: DLWWDW
Form in all competitions: WDWWWW

Possible starting lineup: Fielding, Ayling, Flint, Williams, Cunningham, Elliott, Smith, Freeman, Bryan, Emmanuel-Thomas, Smith

West Ham United:

Form in FA Cup: DLLDW
Form in all competitions: LDDDDW

Possible starting lineup: Adrian; Jenkinson, O'Brien, Tomkins, Cresswell; Song, Noble, Nolan, Downing; Carroll, Valencia

Sports Mole says: 1-3