Lassmar said both are still undergoing treatment and trying to recover for the knockout stages.
Neymar did not join his team-mates in the stadium on Monday due to a mild fever, which Lassmar said was under control and not affecting treatment for his ankle problem.
Several Brazil players were ill on Sunday, including midfielder Lucas Paqueta, who missed Saturday’s training session and was substituted at halftime in the game against Switzerland.
Midfielder Casemiro showed his strikers how to finish when he scored an unstoppable late shot to seal a 1-0 win as Brazil progressed to the knockout stages.
Coach Tite held a short training session on Tuesday involving the players who did not start against the Swiss. He is expected to rotate his team for the Cameroon match as Brazil could play their last 16 match on Monday if they top Group G.