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Chelsea boss Thomas Tuchel admitted the Blues were lucky to keep a clean sheet in the 2-0 FA Cup victory over Sheffield United.
An Oliver Norwood own goal and a late Hakim Ziyech strike secured victory over Sheffield United but the visitors were guilty of missing some good opportunities.
“It was a tough match,” Tuchel told BBC Sport.
“We had a good first half where we controlled everything but second half we lost control, we were really tired now.
“I could see after 14 matches consecutive, I could feel us tired and a lack of concentration – many little faults and strong opponent in the second half.
“We were lucky in the second half to keep the clean sheet. I think it was the first time in the 14 matches we have looked tired.
“It’s important to go through in the cup and that was the target and we reached it.”