"This is a huge blow for us" Firmino said.

"It is still difficult for us to understand what happened and where we made a mistake. I do not have an answer for these questions yet. Maybe, I will (have it) tomorrow or later."

Five-time champions Brazil were eliminated from the tournament, while Belgium qualified for the semi-finals, where they will face France in St. Petersburg on Wednesday morning.

The 2018 FIFA World Cup kicked off on June 14 and will continue until July 15, with the matches being played in 11 cities across Russia.