Brazil's players pose for a photograph during a stadium familiarization at the Lusail Stadium in Lusail, north of Doha, Qatar on November 21, 2022. Photo: VCG

World Cup favorites Brazil held their first training session on Sunday but frustrated the hundreds of journalists at the Al Arabi Stadium hoping to see a possible starting eleven ahead of their World Cup Group G opener against Serbia on Thursday.

The five-time world champions are loaded with talent but coach Tite is keeping Brazil's cards close to their chest over the system and players he will use in their first match, with the biggest question mark surrounding Vinicius Jr.

The 22-year-old Real Madrid winger has still to secure a place, with Tite keeping under wraps whether he will pair Fred with his Manchester United teammate Casemiro to strengthen the midfield or unleash Vinicius up front alongside Neymar, Richarlison and Raphinha.

Even the players don't yet know for sure who will be playing from the start against Serbia.

"We have no idea who the starting eleven are - we are ­curious to know what the coach will decide and the ­competition is relentless to secure a spot," defender Alex Sandro told reporters on Sunday.

"Yet, regardless of who plays from the start, we are all prepared, we know what the plan is and what we have to do.

"The last few days in Turin were great and the squad is very confident in what we can achieve."

Brazil started their World Cup preparations at the Juventus training facilities in Italy on November 14, where they held a five-day camp before flying to Doha on Saturday.

In their first training session in Doha on Sunday, Tite ran intense drills working on keeping possession in tight spaces involving the entire squad for a little over an hour.

With no 11-on-11 practice match, however, there were no signs of which players he is planning to start with.

Several countries have suffered injuries but Brazil still have all their players in peak form, which they are celebrating following a busy club schedule especially in Europe.

"I'm sorry for those players who get hurt and will miss the tournament. As to what concerns Brazil have, obviously it's good to have all the players fit and doing well," said Alex Sandro.

In search of a sixth world title, Brazil enjoyed an outstanding qualifying campaign, as they went unbeaten to finish top of the single South American qualifying group. 

Brazil were knocked out by Belgium in the quarterfinals in the 2018 edition in Russia.

Brazil's last World Cup triumph was 20 years ago inspired by the attacking triumvirate of Ronaldo, Rivaldo and Ronaldinho.