After opening-round defeats, Cameroon face Croatia with both teams needing a win to keep their dreams of reaching the last 16 alive.
Volker Finke saw his Cameroon side fall to a 1-0 setback to Mexico last Friday, despite having what appeared to be a valid goal disallowed by offside.
The African nation, who have now lost their last five games at the finals, were left frustrated and know the Croatia clash in Manaus holds the key to their hopes of progressing in Brazil.
With the tournament hosts last up in Group A for Cameroon, Finke has stressed the significance of Wednesday's game, but the 66-year-old will not be panicked into wholesale changes to secure a win.
"When you lose the first match, you have to pick up maximum points in the second to remain in the hunt," he told FIFA.com.
"It's obvious that we need to change something, but in football, the worst thing you can do is call everything into question.
"That doesn't work. In my opinion, you can't succeed like that. Doubts will drive you crazy.
"They lead to other doubts and you can't perform well when you start having doubts.
"That doesn't mean you shouldn't go in for self-criticism, but doubt brings in question the very foundation of football, which is cooperation."
Croatia find themselves bottom of the group after the 3-1 defeat to Brazil in the opening match of the 2014 showpiece, meaning the side ranked 18th in the world will be wary of the need to improve their goal difference.
Coach Niko Kovac watched Italy's 2-1 win over England in Group D on Saturday closely to understand how the conditions at the Arena Amazonia will affect his players.
Kovac wants his side to seize the initiative and is well aware of the importance of a making a quick impact before the humid conditions take a toll.
"We have seen that after 70 minutes (in Manaus) players started to shut down," he said. "That game (England v Italy) was good and showed we cannot keep up the pace from start to finish.
"Who has the ball, dictating the pace (will benefit) and who is chasing the ball will lose energy.
"The first goal will be an advantage, it would be good to go in half (half-time) with a positive result."
Croatia have been buoyed by the news that midfield playmaker Luka Modric is likely to start, despite a knock after the Brazil game.
However, things look bleaker for Cameroon striker Samuel Eto'o, who is a major doubt with a knee injury.
|Coach: V. Finke|
for A. Chedjou 46'
for V. Aboubakar 70'
for E. Choupo-Moting 75'
|´Post-World Cup trauma´ affected Mertesacker|
|Racing Club 0 Guarani 0 (0-1 agg): Draw sees Paraguayans through|
|Hamburg shocked by Karlsruher attack - Labbadia|
|Serie A Preview: Napoli, Lazio eye Champions League|
|Hodgson will not overstay England welcome|
|Scholes: United must keep Di Maria|
|Leyton Orient appoint Hendon|
|Benteke has a buy-out clause - Sherwood|
|US Soccer will support Prince Ali in FIFA election|
|Dynamo disappointed with officials after City friendly abandoned|
|Calls for Suarez appeal gather momentum|
|Eredvisie Review: Vitesse denied by late Uth goal, NAC Breda boost survival hopes|
|Rangers 1 Motherwell 3: McCall´s men facing uphill struggle|
|Hamburg 1 Karlsruher 1: Bundesliga side escape with draw|
|Blatter vows to lead FIFA clear of trouble as corruption scandal rolls on|
|Bundesliga: Bayern Munich season review - League crown not enough to signal successful campaign|
|Genoa forced to wait for UEFA licence|
|Injured Cardozo out of Paraguay squad|
|CONCACAF provisionally dismisses Webb and Li|
|Klopp: Career highlights of a charismatic coach|
|Verona v Juventus: Ogbonna seeks strong Champions League warm-up|
|FA charges Demetriou over betting breaches|
|Atalanta v Milan: Inzaghi faces last chance to prove worth|
|King joins Bournemouth as QPR rebuild begins|
|Plymouth part ways with Sheridan|
|Hernandez banned for three matches|
|Chelsea star Fabregas has nose surgery|
|Blatter: More bad news may follow|
|Galliani hopeful over Ancelotti deal|
|Frontzeck to continue as Hannover coach|
|Tremmel released as Tate waves goodbye to Swansea|
|Arsenal v Aston Villa: Sherwood out to upset holders|
|UEFA open to boycott of World Cup - Platini|
|Porto activate release clause for Casemiro|
|Athletic Bilbao v Barcelona: Catalans seeking second leg of treble|
|Auxerre v Paris Saint-Germain: History beckons for Ligue 1 champions|
|Cole confirms West Ham departure|
|UEFA elect not to boycott FIFA Congress|
|Borussia Dortmund v Wolfsburg: Klopp aiming for triumphant farewell|
|Flamini hails Coquelin impact at Arsenal|
|South Africa deny wrongdoing in World Cup bid|
|Benitez confirms Napoli exit|
|McShane among six released by Hull|
|Cerci committed to Milan|
|West Ham expect Collins to return for pre-season|
|Real deny Pogba bid|
|Important to keep Chelsea squad together - Mourinho|
|Alonso: Gerrard was magic|
|Pochettino silent on Ings speculation|
|Visa threatens to ´reassess´ sponsorship amid FIFA scandal|
|Blatter skips FIFA Medical Conference|
|MLS Preview: Revs not out for revenge against Galaxy|
|MLS Review: Sounders go top in West, Timbers and Galaxy win|
|AFC stands by Blatter|
|Matheus ´alright´ after collapse - Markevych|
|Copa Libertadores Review: River, Inter through to semis|
|Signing Toni a ´long shot´ for Adelaide|
|Ramsey good enough for Barca - Coleman|
|Bacuna pushing for Benteke stay|
|Evans stunner settles City friendly in Toronto|
|Banega: Emery a great coach|
|Emery tight-lipped on Sevilla future|
|Argentina finalise Copa America squad|
|Nike issues statement following arrest of FIFA officials|
|Hero Bacca grateful for Europa League triumph|
|Markevych rues defensive errors in Dnipro defeat|
|AFC Champions League Review: Naft Tehran fairytale continues|
|Emery: We deserved Europa League success|
|Dnipro 2 Sevilla 3: Bacca brace sees holders make history|
|South Africa 0 Malawi 0 (4-5 on penalties): Harawa heroics send Bafana Bafana out|
|CONCACAF and CONMEBOL respond to arrests in FIFA scandal|
|FIFA president Blatter welcomes investigations as corruption probe rocks world football|
|UEFA calls for FIFA elections to be postponed|
|BREAKING NEWS: Advocaat exits Sunderland and retires from club management|
|La Liga: Real Madrid season review - Ancelotti pays the price for disappointing season|
|Zambia 3 Ghana 0: First-half spree does the damage|
|Barnes suffers double knee ligament injury|
|Balotelli to stay at Liverpool - agent|
|Kane at the double in friendly win|
|Norwich make Dorrans switch permanent|
|Ings unsure of next move|
|Bournemouth snap up Federici|
|FIFA ´crisis´ cannot continue - Prince Ali|
|Barton headlines QPR exits|
|Juan demands more from Inter|
|Stoke snap up Haugaard|
|Subotic commits to Dortmund|
|Warner pleads innocence after US indictment|
|Napoli to refuse questions on Benitez´s future|
|USDoJ names indicted FIFA officials|
|Wenger coy over Vidal and Benzema moves|
|Suarez back in training ahead of Copa final|
|Pique: I´ll retire at Barca|
|Gerrard ´blown away´ by Liverpool send-off|
|FIFA ´very happy´ with Zurich arrests|
|Liverpool defender Toure targeting trophies|
|Ramsey eyeing title assault|
|Welbeck out of FA Cup final and England matches|
|FIFA the ´injured party´ as Swiss prosecutors open criminal proceedings|
|Prince Ali saddened by FIFA arrests|
|Pellegrini to make City defence a priority|
|Labbadia giving Lasogga, Olic, Jiracek time|
|Ramsey confident on Wembley chances|
|Swiss authorities confirm FIFA arrests|
|El Shaarawy open to Premier League move - agent|
|Reports: FIFA officials set to be arrested|
|Tigres UANL 2 Emelec 0 (2-1 agg): Mexicans through to Libertadores semis|
|Valencia ruled out of Copa America|
|Coleman: Bale being ignored by Real team-mates|
|Ruddy eyes England recall|
|Benteke will strike fear into Arsenal - Westwood|
|Howe named LMA Manager of the Year|
|Casillas reiterates desire to stay in Madrid|
|Dnipro players pay for fans´ tickets, transport|
|Galliani: I want Ancelotti back at Milan|