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'
|Micronesia thrashed 38-0 as Fiji triumph in Olympic qualifier|
|Schalke stunned by ´machine´ Caicara|
|MLS Review: Keane shines at Gerrard´s Galaxy unveiling|
|Counter-attacking the key for Japan|
|Jimenez happy at Atletico|
|Gerrard predicts ´successful future´ with Galaxy|
|Iniesta can´t see Real selling Ramos|
|Keshi sacked as Nigeria coach|
|Three finals, three defeats for Messi, Mascherano|
|Nani close to Fenerbahce move|
|Sampaoli revels in ´unbelievable joy´|
|Bravo: Copa victory a dream|
|Martino: Argentina should have won|
|Chile 0 Argentina 0 (4-1 on penalties): Hosts end trophy drought|
|Germany 0 England 1 (after extra time): England make World Cup history|
|Kenya 0 Ethiopia 0 (agg 0-2): Hosts sent out of CHAN qualifiers after second penalty miss|
|Dortmund put 17 past Olympians, Bremen hand out thrashing|
|Dinamo Zagreb confirm arrests of coach and club president|
|I didn´t know who Wimbledon guest Klopp was - Brown|
|LeBron James backs Liverpool captain Henderson for FIFA 16 cover.|
|Ramos: I am not negotiating with anyone|
|Valencia complete Mina swoop|
|United States v Japan: US seek final redemption|
|Hanousek consigns Celtic to defeat|
|Roma confirm Dzeko interest|
|Arsenal forward Podolski completes Galatasaray switch|
|Warm Dortmund welcome delights Tuchel|
|Silva vows to fight for Madrid place|
|Mancini hints at Shaqiri and Santon departures|
|Bojan raring to go after return from injury|
|Babel backs Firmino to shine at Liverpool|
|Falcao must wait to impress, warns Chelsea favourite|
|Bartomeu: Deal in place for Turan|
|Parejo re-signs with Valencia|
|MLS Review: Sounders return to winning ways|
|Klinsmann unhappy with USA performance|
|High hopes for Paraguay - Diaz|
|Gareca: More to come from Peru|
|Gerrard had European offers|
|Argentina out to spoil Chile´s party - Martino|
|Sampaoli: Chile won´t change style|
|Di Maria will come good at United - Rojo|
|Peru 2 Paraguay 0: Gareca´s men finish third at Copa|
|United States 4 Guatemala 0: Klinsmann´s men win comfortably|
|´I’d prefer no-one to know my name´ - Bassett|
|Matthews completes Sunderland move|
|Podolski set for Galatasaray medical|
|Gundogan inspires Dortmund victory|
|Inter confirm Montoya capture|
|Murillo joins Inter, as Kuzmanovic and Obi depart|
|Falcao signing not a risk, says former Chelsea star|
|Deeney agrees new Watford deal|
|Confidence and service the key to Falcao success at Chelsea|
|No bids for ´Chelsea target´ Baba, claim Augsburg|
|Derby swoop for Ince|
|Fiorentina consider legal action over Salah ´no-show´|
|Chelsea the team to beat in the Premier League, says Neville|
|Storari exits Juve for Cagliari|
|UEFA removes FFP restrictions on Man City and PSG|
|West Brom hope for new owners within the month|
|Chelsea agree loan deal for Falcao|
|Kuyt eyes trophies on Feyenoord return|
|Chile v Argentina: History beckons ahead of Copa America final|
|Wallace extends Monaco loan|
|Mihajlovic wants to instill fear factor at Milan|
|Mignolet improving at Liverpool - Grobbelaar|
|Mumbai City name Anelka player-manager|
|Olivia the parrot predicts Japan to win Women´s World Cup|
|Lusitans coach blasts Bilic´s ´lack of respect´|
|Sakho eyes more Europa League wins|
|Gareca wants Peru to keep building|
|Chile ´no chance´ if Argentina produce their best - Diaz|
|Ocampos joins Marseille permanently|
|Europa League Review: Cloud-nine Brondby ignite opening round|