The fire engulfed a dormitory at Ninho de Urubu, the youth team training centre of Flamengo in Rio De Janeiro, at around 5am local time on Friday morning.
There is still no official information about what caused the fire. The call for help occurred at 05:17 and the report also states that there are three other people in serious condition.
Flamengo, the alma mater of players such as Zico, Junior and Leonardo, is one of the best-supported clubs in Brazil and is famous around the world.
The fire brigade said in a statement that the center was "in the process of" meeting fire safety standards but did not yet have a certificate of approval.
Images from Globo TV from a helicopter showed smoke emerging from a charred area. Many, particularly those who live outside of Rio de Janeiro, stay at the facilities while training.
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After years of financial difficulties, Flamengo last year spent £4.7million to expand the Ninho do Urubu facilities.
The site features accommodation for young players, several pitches, an aquatic park, a gym, a medical centre and a mini stadium.
The club have posted a message on its Twitter feed that says: "Flamengo is in mourning".
"We are distraught", Flamengo President Rodolfo Landim said outside the complex, where friends, fans and neighbors gathered, some forming a circle to pray.
While there is still no information on what caused the blaze, it was brought under control within two hours.
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The centre is located in the west of Rio de Janeiro, and according to the city's fire department ten lives have been lost.
It would appear that upon hearing the news, Real Madrid star Vinicius Jr - who joined from the Braziian club, tweeted: "What sad news!"
Jefferson Rodrigues, who runs a small inn near the club, said he had reached a 15-year-old player he had befriended.
Joao Pedro da Cruz, a 16-year-old player in the Flamengo youth league, told the G1 news portal that he decided not to spend the night at the facility because the team wasn't going to train on Friday, and he went to a friend's house instead.
"The majority of them (the team) stayed, my friends stayed (at the facility)", he said.
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