Chelsea boss Mauricio Pochettino insists they didn't deserve defeat to Nottingham Forest.
Forest won 1-0 in London thanks to Anthony Elanga's goal.
Pochettino said, It is so difficult because I think we should win this game but we made one mistake, one we cannot make. That is why we feel really disappointed and then we created a lot of chances but were not clinical in front of goal.
We should be more clinical because we dominated the game and then we knew Nottingham Forest play with a low block and are difficult to break down. We made a big effort but then we made some mistakes.
"We became rash in our decisions and were not capable of scoring. It is part of the process. We need to continue working. The competition is tough, we are a young team and we need to learn from this."