Scolari said: "We have a style of play and we need to change that sometimes. We will change that style when we have a player with a different style.
"When I came to Chelsea, I said I wanted one player who is different - someone who'll try something different when we play against teams who close us down.
"But now we have a style of play and we need to stick with it. It's easier for us to play away because opponents open up more and give us more chances.
"We have more opportunities to open up the play, with more space."
Scolari added: "I want what I said when I arrived here. I need two or three systems of play, not just one.
"I don't know if the player I need is Robinho. I have good players for one system, but I need sometimes to change my system."