Oscar has been ruled out of Wednesday's game against Sunderland with the ankle injury he picked up over the weekend.
Oscar delivered the first of two Chelsea goals and the Blues cruise to a 2-0 win at Stamford Bridge.
Jose Mourinho believes Oscar is Chelsea's best player right now and he wants to build the team around him.
Oscar scored Chelsea's only goal in their first Champions League match of the year but it wasn't enough as Chelsea lost to Basel 2-1.
Chelsea midfielder Oscar has picked up a minor right ankle injury while training with the Brazilian national team.
Oscar scored the first goal in Chelsea's 2-0 win over Hull City on Sunday.