Sam Allardyce has billed West Ham's home clash with fellow Premier League strugglers Sunderland on Saturday as "critical".
The London club were consigned to a 4-1 hammering at Liverpool last weekend and have now lost four of their last five top-flight matches.
That dismal run has left them languishing perilously above the relegation zone, level with Fulham and Crystal Palace - who are 18th and 19th respectively - and five points clear of Saturday's opponents.
Bottom-of-the-table Sunderland have picked up just two points on their travels in the Premier League this season, though, and West Ham boss Allardyce is not playing down the importance of his side's encounter against Gus Poyet's team.
He said: "It's a critical game for both teams. Both teams need to win and listening to Gus' quotes that's their objective.
"Every team in the Premier League can be difficult to break down and most games are decided by a bit of luck or mistakes that you make.
"We need all the lads that are available to step up to the plate and try and repeat the Fulham performance and get the same result."
Allardyce will have to do without skipper Kevin Nolan, who starts a three-match ban following his red card at Anfield, but fellow midfielder Ravel Morrison returns from suspension.
Defender James Tomkins (hamstring) will undergo a fitness test ahead of the match, but Allardyce expects James Collins and Guy Demel to be available despite being unwell this week.
Stewart Downing (leg wound), Winston Reid (ankle), Andy Carroll (foot), Mladen Petric (calf), and Ricardo Vaz Te (shoulder) are definitely out.
Sunderland are rooted to the foot of the table with only eight points from 15 games, and Tottenham condemned them to a third defeat in their last four last weekend.
Poyet's honeymoon period at the Stadium of Light is over, and the Uruguayan is eager to secure Sunderland’s first away win of the season at Upton Park.
"We know what we are coming up against and how difficult it will be," he told the club's official website.
"We need to stand up and do the right things all the time, be very strong as a group as well as being brave on the ball and making things difficult for them.
"Then, you always have a chance to win. We need to start winning games and we’ve got another opportunity on Saturday."
Poyet will be hoping Carlos Cuellar (hip) is available for the trip to London, but goalkeeper Keiren Westwood (shoulder) remains doubtful.
|Coach: S. Allardyce|
for M. Jarvis 56'
for G. Demel 58'
for J. Cole 75'
|Real Madrid 2 San Lorenzo 0: Spanish giants complete triumphant 2014|
|McCoist: Departures sucking life out of Rangers|
|Hargreaves urges Sterling to stay put|
|Herediano 1 Deportivo Saprissa 1 (agg 3-5): Draw hands visitors consecutive titles|
|Tribulietx basks in Auckland City´s heroics|
|San Lorenzo´s Bauza applauds Ancelotti|
|Wenger: Sanchez a Footballer of the Year candidate|
|Chelsea like United´s treble-winning team - Hargreaves|
|Ancelotti: Copa del Rey victory inspired Real´s stunning run|
|La Liga Review: Catalan clubs triumph|
|Milan on right track - Inzaghi|
|Estoril 1 Vitoria Guimaraes 0: Kleber checks visitors´ momentum|
|Eredivisie Review: PSV in Eagles demolition, AZ downed at home|
|Garcia fumes at missed handball|
|Serie A Review: 10-man Milan frustrate Roma, Cesena rescue point|
|Roma 0 Milan 0: Hosts denied despite Armero red|
|Ligue 1 Review: PSG held at home, Monaco claim fourth win in a row|
|Bundesliga Review: Bremen off bottom with Dortmund win, Augsburg beat Gladbach|
|Blanc frustrated after drab stalemate|
|League Two Review: Moore´s Hartlepool tenure begins with draw|
|Championship Review: Blackpool hit for six, Middlesbrough slip up|
|Luis Enrique enjoying Pedro´s resurgence|
|Scottish Premiership Review: Aberdeen move to second, St Mirren misery continues|
|Koeman delighted with clinical Southampton|
|Pochettino tips in-form Kane for England call-up|
|Dortmund are ´idiots´ - Klopp|
|Allardyce hails ´outstanding´ Downing|
|Young admitted fault after Agbonlahor dismissal, says Lambert|
|Pearson not concerned with speculation|
|Bruce: Hull simply not good enough|
|Everton must improve - Martinez|
|Irvine rues sloppy defending|
|Cruz Azul 1 Auckland City 1 (2-4 on pens): Plucky New Zealanders claim third|
|Austin an example for young strikers - Redknapp|
|Dyche takes pride in White Hart Lane defeat|
|Arabian Gulf League Review: Al Shabab strike late to sink Al Dhafra, top two win|
|Swansea win vindicated changes, says Monk|
|Van Gaal frustrated by dropped points at Villa|
|Paris Saint-Germain 0 Montpellier 0: Champions frustrated by Courbis´ men|
|League One Review: Wilson gains landmark win as Bristol City and Swindon falter|
|Hull City 0 Swansea City 1: Monk´s men celebrate rare away win|
|Southampton 3 Everton 0: Koeman´s side back to winning ways|
|Aston Villa 1 Manchester United 1: Visitors held despite Agbonlahor dismissal|
|QPR 3 West Brom 2: Austin treble lifts hosts out of drop zone|
|Barcelona 5 Cordoba 0: Suarez opens Liga account in emphatic win|
|Tottenham 2 Burnley 1: Lamela stunner wins it for Spurs|
|West Ham 2 Leicester City 0: Carroll, Downing seal the points|
|Werder Bremen 2 Borussia Dortmund 1: Hosts off the bottom by adding to Klopp´s woes|
|Kerala Blasters 0 Atletico de Kolkata 1: Last-gasp Rafique seals inaugural title|
|Warnock fumes over disallowed goal|
|Pellegrini hails Silva quality|
|Betis announce Mel return|
|Huntelaar signs Schalke extension|
|Juventus v Napoli: Allegri backs Tevez to make difference|
|Stoke City v Chelsea: Mourinho calls for adaptability|
|Manchester City 3 Crystal Palace 0: Silva strikes twice as champions go joint-top|
|A-League Review: City snatch Melbourne derby honours, Glory pull further clear|
|Mancini: Inter can finish third|
|Sterling revels in Golden Boy award|
|Pellegrini: You never win a title in December|
|Rodgers bemoans Sanchez snub|
|Ayew confident Marseille can beat title rivals|
|Mercier: San Lorenzo won´t roll over to Real Madrid|
|Lukaku: I´m still 21|
|Mainz bemoan ´tragic´ loss to Bayern|
|Rojo ruled out for Villa trip|
|Lopetegui thrilled with Porto response|
|Guardiola pays tribute to battling Mainz|
|Orlando City sign Shea|
|Porto 4 Vitoria Setubal 0: Brahimi inspires late drama|
|League Two Review: Burton held, Cambridge snatch late point|
|Millwall 0 Bolton Wanderers 1: Pratley nets winner for visitors|
|Lens 2 Nice 0: Cyprien and Coulibaly lift hosts|
|Celta Vigo 0 Almeria 1: Nolito miss proves costly|
|Heerenveen 0 ADO Den Haag 0: Visitors´ winless streak extended|
|Mainz 1 Bayern Munich 2: Guardiola´s men break Christmas points record|
|Blanc unconcerned by league placing|
|United targeting title - Carrick|
|Soldado ´ashamed´ at not performing for Spurs|
|Ramos to wait and see on fitness for final|
|Garcia wins appeal against two-match ban|
|Hart signs new City contract|
|Hereford United wound up|
|Pearson given touchline ban for fan row|
|FIFA confirms third-party ownership ban|
|Inter v Lazio: Ranocchia wants to build momentum|
|Rodgers hits out at Sterling criticism|
|Pardew backs Colback to shine against Sunderland|
|Minimal recovery time a concern for Bauza|
|Liverpool v Arsenal: Wenger out to avoid repeat performance|
|Newcastle United v Sunderland: Pardew calls for a derby day show|
|Adebayor available for Burnley clash|
|Athletic Bilbao v Atletico Madrid: Simeone´s men eye fitting response|
|Targett commits to Southampton|
|Garcia vows to attack Milan|
|City still without strike trio for Palace test|
|Courtois set for return at Stoke|
|Di Maria set for possible United return at Villa|
|Neymar in frame for Cordoba match|
|FIFA to publish Garcia report|
|Liverpool will not appeal Balotelli ban|
|A-League: Newcastle Jets 2 Adelaide United 1|
|Fournier eyes Fekir stay and attacking reinforcements|
|Abidal announces retirement ahead of potential Barca return|
|Redknapp: Crouch deal not possible|
|Klaassen laments Ajax ´off-day´|
|Wenger not fearful of another Anfield nightmare|
|Whelan wants to extend Stoke stay|
|Kalou eyes Hertha exit|
|Fellaini: Belief growing of title tilt at United|
|Benteke: Villa transfer request was a mistake|
|Gerrard urges Sterling to stay put|
|Pardew calls for calm ahead of derby clash|
|Kerala Blasters v Atletico de Kolkata: Luis Garcia talks up team ahead of final|
|Monk wants three new Swansea signings|
|Koeman plays down Sneijder link|
|Howard targets another World Cup|
|Inzaghi prepared for Stadio Olimpico atmosphere|
|Toronto expect Defoe to return|
|Rodriguez suffers injury setback|
|Klopp denies Dortmund departure plans|
|Copa del Rey Review: Bilbao and Elche edge through, Madrid derby beckons|