There was a lot of anxiety, too much pressure and it translated into our way of playing, we were not precise enough.
In all, Swiss players ended up with three yellow cards.
Serbia and Costa Rica fill out a competitive Group E, but Djourou feels Switzerland can qualify for the knockout rounds in Russian Federation.
Five minutes into the second half, Switzerland did manage to equalise when Steven Zuber headed home a corner-kick from a four-yards out, 1-1. "Of course I'm not happy with the result".
Neymar's injury problems did not stop him from scoring both in his return to action against Croatia as well as against Austria, but Brazil boss Tite admitted during his pre-match news conference that the 26-year-old was not in peak condition yet.
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This tournament is a chance for Suarez to play controversy-free soccer at this year's World Cup . There's a long way to go in this World Cup , but it's already given us so much to talk about.
Ramos also ignored a penalty claim late in the game when Gabriel Jesus was brought to the ground by Switzerland defender Manuel Akanji.
Brazil will be hoping for a reversal in fortune and a better showing from Neymar when they take in a second Group E fixture against Costa Rica on Friday.
"I was a little bit anxious about the referee", said Arsenal full-back Lichtsteiner.
The Brazilians remain haunted by their 7-1 loss to Germany in the 2014 World Cup semifinals that was followed by a 3-0 defeat against the Netherlands in the third-place playoff.
"The Serbs are a great team with players who have been together for a couple of years already".
Live updates of the Group C match between Brazil and Switzerland at the 2018 FIFA World Cup.
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Speaking after the full-time whistle, Petkovic said via BBC Sport: "I'm very proud and pleased with the discipline with the way we played". "If everyone does his job, then the team grows and plays well".
"At this stage of a World Cup you have to take advantage of a goal and see that your opponents are taking risks and you need to have faster transitions".
He said he wouldn't make excuses for the disappointing scoreline.
Switzerland were unable to really threaten the opposing goal and were more conspicuous with their tough challenges on the Brazilian playmakers with Neymar spending his fair share of time on the ground grabbing various parts of his body.
Germany 'played very badly' in Mexico loss - Loew
A grandmother who blessed every Mexican player as they appeared on screen before a World Cup clash with Germany has been credited with her side's surprise victory.