The Blues managed to reach the semi-finals with a poor performance.
boss Thomas Tuchel claimed after his side's victory over Sheffield United that his side were not focused enough and lost control of the game in the second half.
The Blues beat Sheffield United 2-0 in the FA Cup on Sunday to advance to the semi-finals. Chelsea's first goal was scored by Oliver Norwood's own goal andHakim Ziyech
scored the second goal in the 92nd minute. After the game, Tuchel, dissatisfied with his team's performance, claimed that his team's performance in the second half disappointed him.
"It was a good first half but in the second half, we lost control,"
he told BBC Sport.
"We were clearly tired after 14 games consecutively, I could feel us tired with a bit of a lack of concentration.
"There were many little faults with a strong opponent in the second half. We were lucky in the second half to keep the clean sheet. I think it is the first time in the 14 matches where we were lucky. It can happen and, in the cup, it is important to go through and this was the target. We reached it.
He added: "Of course, we let them come back because we had full control in the first half. In the second half, we had a big chance with Christian [Pulisic] to finish the game early. After that, we had too many easy mistakes, lost duels and lost concentration and momentum.
"Honestly, I could feel in training in the last days that we were a bit tired with a lack of concentration and things were not too easy. It is normal that it can happen in a game where it is difficult to keep the level up. I was happy to help the guys from the bench with the guys who came in. In the end, we have a win and we will take it."