The Brazilian international has been played in a number of attacking positions this season but found himself in a rather unusual position at Selhurst Park.
With Spanish international Cesc Fabregas being tightly marked, Oscar dropped back into space and controlled proceedings in the middle of the park alongside Nemanja Matic.
|Team||Pos||Goals||Shots||Chances Created||Won Tackle||Pass Completion||Apps||Mins|
As per the table provided by Opta stats, the Blues’ Man of the Match was instrumental throughout as he tested the goalkeeper three times and created two chances while also helping out defensively.
After the game, Mourinho explained Oscar’s role to the press and revealed the 23-year-old's strengths of not being your conventional number 10.
"Oscar, in this moment, is not a number 10," the Blues boss said, quoted by the Independent. “He had an evolution, a mental, tactical evolution that allows him to be a fantastic player.
"Can he physically improve? Of course. People forget that he is still so young. He's not a number 10 that plays with the ball at his feet, he's a number 10 that looks back, looks to the side, analyses the game and sees where the team needs him to move to get the ball and also to create balance.
"In the first half when they had (James) McArthur playing man to man with Fabregas, I was so happy with that. Fabregas was taking McArthur from the central area and Oscar was dropping back to play. Oscar and (Nemanja) Matic controlled the game completely for us."
Since joining the Stamford Bridge outfit from Internacional in 2012, Oscar has represented the club 117 times in all competitions, scoring 25 goals in the process.
His eight strikes last season was his best Premier League goals haul to date, and he will be looking to push on this term and reach double figures.