All but one of coach Tite's starting line-up in World Cup qualifiers was confirmed in the squad Monday: Alisson; Miranda, Marquinhos and Marcelo; Casemiro, Paulinho, Renato Augusto and Philippe Coutinho; Neymar and Gabriel Jesus.
The Paris Saint-Germain forward, 26, is on the comeback trail from a broken foot, less than a month out from the start of the showpiece event.
Neymar conceded the injury has left him in a "difficult moment", and he said, "nobody is more anxious than me and nobody is more afraid than me".
Brazil will need him to show all the skills that made him the world's most expensive footballer and versatile footballer, with a record €222 million (US$264 million) transfer from Barcelona to PSG last August.
And the Argentine admitted seeing his former team-mate at Madrid would be a huge blow.
When asked if he was open to a move from Barca after playing for the senior team for 14 long years, Messi said, "I am not tempted to leave Barcelona".
"I want to win the Champions League every year, to be a league champion every year".
"And on a football level, it would make Madrid much stronger than they already are".
In an interview with TyCSports, Messi opened up on discussions he has had with Neymar.
Both Marcelo and Neymar were named in Brazilian manager Tite's 23-man squad for the World Cup this summer, but the left-back has revealed that talk in Russian Federation will be exclusively fixed on the tournament and not on club football.
Messi and Argentina begin their World Cup campaign against Iceland on June 16 after having lost on penalties to Germany in the final in 2014.
Should he end up joining Real, Neymar will follow in the controversial footsteps of countryman Ronaldo and Luis Figo.