The 25 million pounds recruit from Internacional is one of five attacking midfielders the Blues have signed this summer.
The 20-year-old, who is part of Brazil's Olympic football squad, insists he is happy to be Di Matteo's flexible player.
"This is a dream for me. After the Olympics I am going to talk to the manager. I am ready to do whatever the manager wants me to do," The Daily Star quoted Oscar, as saying.
"For Internacional I played in several different positions, so I have no problem adapting," he added.
Champions League and FA Cup winners Chelsea  finished sixth last season in the Premier League but Oscar is confident he can add to the honours he has won with Internacional and Sao Paulo.
"I'm joining Chelsea hopefully to win more titles. The project is very exciting, especially with the young players that they are signing. The offer was very good for me and I didn't have to think twice about signing,' Oscar said.
"I am good friends with David Luiz, there's also Ramires and Lucas Piazon at Chelsea, so they will help me adapt," he added. (ANI )