Midfielder Ederson, who is set to join Manchester United, received a late call-up to the squad and has reportedly been tested at right-back during training sessions. Danilo and Roger Ibanez are also options on the right side of defense.
Premier League stars Alisson Becker, Gabriel Magalhaes, and Bruno Guimaraes are all expected to start alongside Real Madrid forward Vinicius Junior and Barcelona winger Raphinha.
Ancelotti is still weighing up his options at center-forward, with Matheus Cunha, Endrick, and Igor Thiago all competing for the role.
For Morocco, central defender Nayef Aguerd and winger Abde Ezzalzouli have both been ruled out of the World Cup and replaced by Marwane Saadane of Al Fateh and Amine Sbai of Angers.
Ezzalzouli sustained his injury during the friendly against Norway. In the same match, Noussair Mazraoui was forced off with a shoulder problem.
While the issue is not believed to be serious, a final decision on his availability will be made closer to kick-off.
Captain Achraf Hakimi and Brahim Diaz are expected to feature from the start. Diaz recently scored his 14th international goal in just 26 appearances during the draw against Norway.
He is likely to form part of a fluid attacking trio alongside Bayern Munich target Ismael Saibari and highly-rated youngster Bilal El Khannouss.
A victory over Brazil would send a major statement to the rest of the tournament and significantly boost Morocco's chances of topping Group C in what promises to be a fascinating clash between two nations separated by just one place in the FIFA rankings.
Match Prediction
This has all the ingredients of one of the most entertaining matches of the opening round. Brazil possess world-class quality throughout the squad, but Morocco have repeatedly demonstrated their ability to compete with elite opposition on the biggest stage.
The Atlas Lions are organized, disciplined, and dangerous on the counterattack, while Brazil's attacking firepower makes them a constant threat going forward.
With both teams carrying genuine ambitions of winning Group C, an open and highly competitive encounter could be on the cards.
Klik Saja Prediction: Brazil 2-2 Morocco