Under ex-Blues boss Jose Mourinho, he played behind the striker in an attacking role.
However, the midfielder has revealed new Blues boss Conte is playing him in the right position as a box-to-box midfielder.
"He's [Conte] giving me a lot of confidence and I'm doing very well. Hopefully I can continue to do so," Oscar told the London Evening Standard.
"In the last few seasons I have played as a no.10 or as a winger. Now I'm going back to my original position of No.8, attacking and defending from box to box, which is my original role and the one I like the most.
"It's been a very successful time for me here at Chelsea. I won a lot in the last few seasons - the Premier League, League Cup and the Europa League.
"Only last season wasn't great, not only individually, but as a team. Hopefully this season we will win trophies and get back to a winning mentality.
"The objective is not only to finish in the top four, but to fight for the League, FA Cup and League Cup because we have to win trophies."