With Marcus Rashford on-loan from Manchester United, Deco says Barca are unlikely to act in the January market.
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Deco stated: "If we are doing well and there are no surprises, I don't think it's necessary.
"We know exactly where we can improve and the difficulties we face. Last season, we also went through some difficult moments and we were able to overcome them.
"When we lower the intensity, we suffer. We need to have the best players. There are no excuses, but when you can't make changes because of injuries and they affect our midfield. There are things to improve even when we win."