Allardyce has already urged his side to put in a similar performance that saw them score six without reply against Brighton & Hove Albion at the weekend.
With very few injury concerns, the manager is not expected to make any changes from the side that recorded that comprehensive win over the Seagulls.
If City win the encounter then Portsmouth will be relegated. However, they have only been able to win two homes matches from their last six attempts.
Bristol City: DDDWWD
West Ham: DWLWDW
Bristol City: Gerken; Foster, Amougou, Carey, Fontaine; Skuse, Cisse, Pearson, Woodford; Stead, Wood
West Ham: Green; Demel, Tomkins, Reid, Taylor; Noble, O'Neill, Lansbury, Nolan; Cole, Vaz Te
Sports Mole says: 2-2