Of the ten, four are Flamengo youth team players, two are young boys on trial, and four are club employees.
The fire broke out on Friday at Ninho do Urubu, a state-of-the-art training centre that was expanded and opened only two months ago.
The cause was not immediately known, but local newspaper Extra said witnesses alleged the fire started in the air conditioning system.
He did not take questions from reporters who also were outside the complex but added: "The most important thing right now is to minimise the suffering of these families".
Local reports stated 10 people were feared to have died, while fire department chief Douglas Henaut confirmed the incident occurred at the lodgings.
Local media reported that the fire happened in a dorm where youth players sleep. The ages of the injured were 14, 15 and 16, according to a fire official who spoke on condition of anonymity because of agency rules.
Brazil's Pele, widely regarded as the best player to ever live, said: "It's a very sad day for Brazilian football". The fire was reportedly controlled around 7:20 a.m.
Like many clubs who sign youngsters from across the country, the facility has accommodation for teenagers, although it was unclear exactly how many players were among the dead.
Felipe Bornier, the Rio state sports secretary, told journalists that "we must absolutely give all the support necessary to the victims' loved ones because a lot of them aren't from Rio".
The Ninho de Urubu ("Vulture's Nest" - so named because the symbol of the club is a vulture) centre underwent a major expansion past year, with the club spending 23m reals (£4.8m, $6.2m), Reuters news agency reports.
Teenage Real Madrid forward Vinicius Junior, who came up through the youth ranks at Flamengo before signing with the European Champions in 2017 for 45 million euros ($51 million), posted a message on Twitter asking people to pray for the victims.
Youth league teams also train at the facility, known as Ninho do Urubu, which means "the vulture's nest".
Real Madrid forward Vinicius Junior, who joined the club from Flamengo previous year, said: "Just remembering the nights and days I spent at the training center, it gives me goosebumps".
The fire follows days of heavy rains that hit the city and claimed at least six lives.
"What a shock getting this news here on the other side of the world", Brazilian midfielder Zico wrote on Instagram.
Originally drafted by the Pistons with the eighth overall pick in 2015, Johnson's entry-level contract expires in 2020. A report says the Milwaukee Bucks will be getting a key member of the New Orleans Pelicans .
Initial rumours named both Valanciunas and Kyle Lowry in a potential deal for Gasol and Memphis point guard Mike Conley . The veteran small forward holds a player option worth $8.7 million for next season.
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He owns the Washington Post , which has written critical stories about Trump, who counts Pecker as a close ally. Bezos's long-time security consultant to describe photos the Enquirer "obtained during our newsgathering".
My father was a tough, hard-nosed guy who, you know, didn't have a father and pushed me to limits I never thought I'd get to. And my mother, being the loving little lady that she is, I was never late to a practice.
In addition to USA presidents, leaders from around the world and of various faiths are also invited to attend the breakfast. Trump lifted a line directly from his State of the Union address when highlighting his anti-abortion stance.
Since then she has thrown herself into charity work, especially her "To Be No. 1" foundation to fight youth drug abuse. He said: "I am not aiming to extend my power but I am doing this for the benefit for the country and the people".
Hood is a career 36.8 percent shooter from the 3-point line and is shooting 36.2 percent from deep this season. Maker, 21, was drafted 10th overall by the Bucks in the 2016 NBA Draft but he has not lived up to the hype.
Doug Collins , the top Republican on the panel, called the subpoena authorization "political theater" before the vote. The hearing will be the committee's first major oversight hearing looking at the Justice Department of this Congress.
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XFL hiring a big name coach
Stoops coached the Oklahoma Sooners to a 190-48 record before he announced his retirement on June 7, 2017. The Rangers are moving into a new stadium across the street from Globe Life Park.
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