Barcelona signing Douglas has revealed he can play in several positions.
Douglas arrives primarily as a right-back, but admits he can be utilised elsewhere.
"I played for eight months as a striker, but then I became a midfielder, which is where I stayed until I was seventeen.
"At Sao Paulo I got the chance to play as a winger now and again, but it's as a full-back that I want to find my place in world football.
"That's where I like playing best."
Douglas accepts he needs to adapt to coach Luis Enrique's system.
"I'll listen to everything Luis Enrique can say to make me better. I want to develop my sense of tactics at FC Barcelona But I like working hard. In football, you earn your chances by working hard in training."
