That timeline could rule him out until after next month’s international break when Chelsea return to action against Premier League London rival Arsenal on 21 October.
In the meantime, Lavia could miss Chelsea’s matches against Bournemouth, Aston Villa, Fulham and Burnley in addition to the Carabao Cup third round fixture with Brentford.
Lavia joined Chelsea from Southampton in a £58million deal in August.
The 19-year-old, however, is still waiting to make his debut for the Blues.