Chelsea midfielder Enzo Fernandez has returned early from international duty due to synovitis in his right knee, according to Argentina's official website.
Fernandez has been an undisputed starter for the Blues alongside Moises Caicedo in midfield and it remains to be seen whether he will be fit for the restart.
The former Benfica man has returned early due to a knee concern and he will be assessed at the Cobham training centre ahead of the season restart.
Chelsea made a big statement with a 2-1 win over Liverpool before the international break. As a result, they ended a three-match winless league streak.
The onus will be on building a winning streak after the international break. Fernandez is a key player in the starting line-up and the Blues will be hoping that he is fit soon.
The Blues face Nottingham Forest on the road in the season restart. They will go into the game as favourites, given the poor form of the Tricky Trees this term.