"It is the first time I play in that position but it is different when you have four midfielders because the others help defend and I have more space to play," he told chelseafc.com.
"I think this is important and I like it because it is mainly about distribution."
Deco added: "It was a good test against a good team, Seattle play well, they work all the game. The pitch was a little soft but it was okay.
"The players' legs are now feeling heavy at this moment but we need to improve and it is important to play and train hard. We start now and we need more games."