Oscar has been ruled out of Chelsea’s game at West Brom on Sunday.
The Brazilian missed last weekend’s defeat at Manchester City after picking up an injury in training.
And he is unavailable for the trip to The Hawthorns, where Chelsea will be looking for their first win of the season having lost at City after drawing at home to Swansea.
Victor Moses has also been nursing an injury and he too is unavailable on Sunday.
But goalkeeper Thibaut Courtois will return to the side after serving a one-match ban following his sending-off against Swansea.
Meanwhile, Jose Mourinho has suggested that John Terry will retain his place in the starting line-up despite the skipper being replaced by Kurt Zouma at half-time against City.
Asked if Terry would be selected, the Blues boss said: “Maybe. Why not? Normally he is in the team, so why not?”
Mourinho added that he was unsure whether new signings Pedro and Baba Rahman would feature against the Baggies.