Assistant manager Keith Millen says Crystal Palace will take "no risks" with summer signing James Tomkins as he continues his recovery from a hamstring strain.
Crystal Palace have confirmed the signing of West Ham defender James Tomkins for a fee believed to be in the region of £10m.
James Tomkins is not on West Ham's pre-season tour in the United States.
James Tomkins is likely to miss a "few weeks" following a calf injury at Southampton on Saturday.
Cheikhou Kouyate is expected to recover from the minor knock which forced him off during the first half at Anfield on Saturday but James Tomkins remains a doubt.
James Tomkins will be assessed after limping off at St James Park in game week twenty-two but Joey O’Brien is fit and available for selection.
James Tomkins scored a last minute goal from a Mauro Zarate cross to give West Ham a 1-0 opening leg win over Birkirkara in the Europa League on Thursday.
James Tomkins is hopeful to feature in West Ham's last match of the season.
James Tomkins will miss the remainder of the season after going through shoulder surgery.
James Tomkins will miss gameweek 29 due to a dislocated shoulder.
James Tomkins confirmed that he broke his nose when he suffered a clash with Marouane Fellaini on Sunday.
Six of Allardyce's regular first team players are in line to miss the clash against Manchester United this Sunday at Upton Park.
Sam Allardyce will need to check on a number of players ahead of the trip to Anfield after last weekends’ bruising encounter against Bristol City in the FA Cup.
James Tomkins is suspended for GW20 for an accumulation of yellow cards.