Oscar, and not Juan Mata, is to be Chelsea's attacking fulcrum under Jose Mourinho.
After four matches without a win ahead of today's west London derby in the Barclays Premier League, Mourinho's methods have been scrutinised, particularly his omission of Mata.
The Spain playmaker, Chelsea's player of the year in each of the last two seasons, his first at the club, has been told to adapt his game to have a future with the Blues.
"It's part of a process with him (Mata)," Mourinho said. "One thing is to play with Ramires and Oscar in the side, them closing (down) each side, and Mata as a number 10 behind a striker, to have clever assists and to have clever passes; fantastic actions because he has great talent.
"Another thing is to adapt to the way we want to play. In this moment, Oscar is my number 10 and, if somebody tells me that Oscar is not Chelsea's best player since the beginning of the season, I'd have to disagree.
"I want to build with Oscar as my number 10. I want the other two players, from the side (wings), to adapt to that reality and to learn how to do things that they were not ready to do before."
Although he would not elaborate on his reasons for leaving Mata on the periphery, Mourinho's initial thoughts appear clear.
The World Cup winner, who signed a five-year contract when he joined from Valencia in 2011, has made three appearances this term, but was hauled off after 65 minutes against Aston Villa, 57 minutes in last weekend's defeat at Everton and featured for 23 minutes against Basle, who inflicted Chelsea's first home Champions League group stage loss in nearly 10 years.
In World Cup year he is unlikely to be content with being marginalised, a decision which fans and pundits alike have questioned.
"There are things I cannot speak with you about," Mourinho said.