The 32-year-old collided with opposing defender Davinson Sanchez in Brazil's 2-1 win against Colombia in South American 2026 World Cup qualifying action on Thursday.
Under FIFA's concussion protocol, Alisson left the field in the 78th minute and must take a break, meaning he will miss out on Brazil's clash with Argentina.
"Alisson, who suffered a head knock, is fine and has no medical complaints," a CBF statement read.