Chelsea winger Estevao missed the 2-2 draw against Brentford at the weekend due to illness.
The forward felt unwell during his time on international duty with Brazil, and he has not trained since his return to the UK.
Estevao could be back in contention when the Blues travel to Germany for their first Champions League fixture later this week.
If not, it will be hoped that he the teenager will be available to face Manchester United on Sunday.
Expected Return Date – Wednesday, 17th September vs Bayern Munich (a)
Romeo Lavia
The midfielder has been pictured back in training but head coach Enzo Maresca has emphasised that he won’t be in contention to play straight away.
Lavia picked up a muscular injury during the Club World Cup knockout game against Benfica and he has not had a full pre-season.
Expected Return Date – October
Benoit Badiashile
The Frenchman is in the exact same boat as Lavia, having sustained his injury during the same match versus Benfica.
Badiashile will need several weeks to build up his fitness, having last played a competitive match two and a half months ago.
Expected Return Date – October