Brazil are monitoring the fitness of forward Antony after the Manchester United man reportedly missed training through illness on Friday.
Tite's side have already lost Neymar and Danilo through injury after their first game of the World Cup, but the favourites are now sweating they will be another man short for their game against Switzerland on Monday.
According to The Sun, Antony was one of several players to miss training alongside Lucas Paqueta and Alisson.
It's unclear at this stage how serious the illness is, but Tite will be hoping he will be able to call on the 22-year old on Monday.