Chelsea boss Mauricio Pochettino admits they struggled to compete physically in defeat to Nottingham Forest.
The Blues lost 1-0 at Stamford Bridge on Saturday.
Pochettino said, "I think we were good, the opponent was aggressive but in the first 45 minutes we didn't concede one chance, or one corner, it was one set piece but after they didn't create too many things. More aggressive with the ball, we need to be more clinical, more aggressive and shoot to have more capacity to score goals and to win the game.
"The process when you are building a team in an offensive situation, in a game like today, intensity and rash decisions when you need to be relaxed and more calm. This happens and we need to stay calm and work really hard to try to improve.
"We are picking the team we believe is going to be more competitive, help balance the team in the way we want to play. Yes, the more options you have, it is better to increase the level, the competition between them. More possibility to play with in form player and different ideas."