The Blues have got the better of Premier League rivals United 2-0 at Stamford Bridge in London in the quarter-finals of the FA Cup.
An own goal from Blades Oliver Norwood saw Chelsea go ahead after just 24 minutes, and in second minute of injury time, Hakim Ziyech found the back of the net with a low strike.
The win means that Chelsea have progressed to the semi-finals of the FA Cup this season.
While Tuchel is pleased with the victory, the Chelsea manager has admitted that his team were not at their best.
Tuchel told BBC Sport: “Sounds excellent to say we’re through to the semi-finals - it was a tough match. We had a good first half where we controlled everything. We lost control in the second half, we were clearly tired.
“After 14 consecutive matches I could feel we were tired and we made many little faults. We were lucky to keep the clean sheet in the second half but I think it’s the first time in the 14 games we have looked tired. It’s important to go through in the cup and that was the target and we reached it.”
Match Stats
Over the course of the 90 minutes at Stamford Bridge in London on Sunday afternoon, hosts Chelsea had 63% of the possession, took eight shots of which three were on target, and earned two corners.
Visitors United had 37% of the possession, took seven shots of which four were on target, and earned four corners.