Brazil are already without their regular right-back Dani Alves, the Paris Saint-Germain star missing the tournament due to a knee injury.
The world's most expensive player scored Brazil's second stoppage-time goal and was in tears at the full-time whistle.
Brazil's coach Tite also commented on his players tears, suggesting they could be down to the huge pressure of leading the five-times world champions. But the VAR came into play and after viewing replays, the decision was overturned and the spot kick taken away, with Neymar deemed to have over-exaggerated the contact on him. For me it was a penalty. The Brazilian coach, a self-proclaimed critic of the VAR, said: "Brazil does not need the help of referees to win matches".
"I think the joy, the satisfaction and the pride of representing Brazil is a lot". "Individual quality only shows up if it is properly integrated in the group".
"I have to take my responsibility, so does everyone else on the team".
"He is a human being - he needs some time to resume his high standard".
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"He's going to make it".
Superstar Neymar added a second a few minutes later.
The CBF confirmed Tite will name Fagner in his starting XI to face Costa Rica, Brazil having opened their Russian Federation 2018 campaign with a 1-1 draw against Switzerland. He said: "Not everyone knows what I went through to get here".
"The cry is joy, overcoming". In my life, things were never easy, and they wouldn't be now!
Neymar paid tribute to his team-mates and insists Brazil remain on course for the latter stages of the competition, saying: "The dream - no, the objective - is still alive".