Brazil have brushed off claims in the Chilean media that English referee Howard Webb might favour the hosts in the all-south American showdown in Belo Horizonte on Saturday.
Webb was also the man in charge when Brazil beat Chile 3-0 at the same stage of the 2010 World Cup in South Africa.
There was no controversy in that game - in fact the only criticism of Webb was that he could have awarded Brazil a penalty - but nonetheless media outlets in Chile fear the hosts will get an easy ride.
That feeling has been doing the rounds since the opening match of the tournament against Brazil when Brazil were awarded a penalty by Japanese official Yuichi Nishimura for what was a blatant dive by Fred.
Brazil team spokesman Rodrigo Paiva said any such suggestions were disrespectful and "immature".
Paiva told the pre-match news conference: "This kind of pressure I think is ridiculous.
"Brazil doesn't need a referee to win the match and you should respect a little bit more the Brazilian national team and the Brazilian people."
Brazil coach Luiz Felipe Scolari is under growing pressure to pick Manchester City midfielder Fernandinho in his starting line-up when the hosts take on Chile in their first knockout match on Saturday.
Scolari's side looked unconvincing in long spells in their Group A games, but their best period came in the second half of the 4-1 win over Cameroon when Fernandinho had been sent on for Tottenham's Paulinho.
Former players and pundits in the Brazilian media have been hotly debating the best XI as the pursue their dream of a final in the Maracana, and by common consent Fernandinho is the holding midfielder of choice for the showdown in Belo Horizonte.
World Cup 2014: Group stage best XI
World Cup 2014: Group stage best XI
1/11 Guillermo Ochoa - Goalkeeper (Mexico)
The Mexican goalkeeper produced a man of the match display to keep Brazil at bay and has been at the heart of a resolute defence that has helped put the side in the knockout stages.
2/11 Serge Aurier - Right-back (Ivory Coast)
Reportedly on the radar of several Premier League clubs and you can see why. Provider of some crucial assists already, he has looked a serious talent.
3/11 Rafael Marquez - Centre-back (Mexico)
The veteran centre-back has turned back the years to marshal a disciplined Mexican defence and lead his side into the knockout rounds.
4/11 Mario Yepes - Centre-back (Colombia)
Another old-timer who many thought had his best years behind him. Yepes has looked solid for Colombia and even managed a marauding run through midfield at one point.
5/11 Daley Blind - Left-back (Netherlands)
The Netherlands man provided the superb assist for Robin van Persie's magnificent header, and Blind has offered a different option with his charges forward down the left-flank. Has the most assists in the tournament so far alongside Juan Guillermo Cuadrado.
6/11 Philipp Lahm - Defensive midfielder (Germany)
The Germany captain had a quiet start to the tournament as he let the attacking-minded players take the plaudits against Portugal. But he has controlled the strings since, completing more passes than any other player, and his versatility means Muller, Mesut Ozil and the likes can push on to leave Lahm marshaling the back-four.
7/11 Arjen Robben - Right-wing (Netherlands)
Robben's pace to blow away Sergio Ramos summed up his performance in the 5-1 dismantling of Spain, as he starred throughout the Netherlands' group campaign. Three goals from his eight shots represents a very solid return.
8/11 James Rodriguez - Right-wing (Colombia)
One of the stars of the World Cup so far, Rodriguez became the Colombian to score in all three of their group games, helping the South Americans to progress to the second round as winners of Group C.
9/11 Lionel Messi - Central midfield (Argentina)
How can you leave Messi out of any best XI? Answer - you can't. Proving the doubters wrong, Messi put in three match-winning performances to help Argentina improve as the tournament goes on and book their spot in the last 16. He takes a roaming midfield role in our XI, but with the way he is playing at the moment, we'll let him play where he wants!
10/11 Neymar - Left-wing (Brazil)
Brazil's poster boy for the World Cup has dominated the headlines since the tournament began. Two goals against Croatia in controversial circumstances, and another brace against Cameroon sees Neymar level with Messi and Muller on four goals so far. Can the golden boy go on to claim the golden boot as well as the golden trophy?
11/11 Thomas Muller - Centre forward (Germany)
With no recognised striker in their starting line-up, Muller has flourished spearheading a German attack that interchanges position at will. If Germany are to be knocked out, Muller will have to be marked out of the game, as he has already shown this prowess in front of goal if he is given the chance.
Scolari was giving little away in his pre-match press conference on Friday, but for the City player it is all going right.
He said: "I've always dreamed of playing in the World Cup and wearing the Selecao jersey, but I knew how difficult that was, what with me playing in Ukraine for Shakhtar.
"Last year, though, when I moved to England and began playing in a much bigger league with a much higher profile, I could see things coming together for me. I fought hard, chased my dream and got the call-up for the friendly with South Africa in March.
"Everything I did from June 2013 onwards was with the goal of making it here to the World Cup."
Scolari, who was coach when Brazil last won the World Cup in 2002, admitted that the tension was building now that it is a case of do-or-die for the hosts.
He said: "It is normal for us to be anxious especially now in the knockout stage where we cannot lose.
"We become more afraid, more nervous, it is normal. Not because it is in Brazil but because it is a World Cup. You only get the chance to get to the final if you win."
Fernandinho's hopes of starting will have been boosted by the fact he also scored a goal against Cameroon despite his main responsibility being in defence.
He added on http://www.fifa.com: "Here in Brazil, we have what we call a primeiro volante: a holding midfielder whose job is just to defend.
"But most of us play our football in Europe now and we're used to getting forward too. Midfielders there also create the play and get into scoring positions. Maybe that's the reason why we've got people who can play in that position and yet still get forward to score and start moves too."