La Albiceleste progressed to Sunday's showpiece after defeating the Netherlands 4-2 on penalties on Wednesday, overcoming Louis van Gaal's side after an uneventful 0-0 draw.
Despite the traditional animosity between Brazil and Argentina, Neymar insists that he would be delighted if it was Messi that lifted the World Cup trophy at the Maracana, calling him a worthy winner.
"Messi deserves to win the World Cup," the 22-year-old told a press conference. "He's my friend, I wish him the best."
Argentina and Germany meet in the World Cup final for the third time, with Die Mannschaft victorious in 1990 and the South Americans winning in 1986.
Neymar, who is out injured after suffering a fractured vertebra against Colombia in the quarterfinals, will watch on as Brazil faces the Netherlands in Saturday's third-place play off.