Goals by Oliver Norwood (OG) and Hakim Ziyech see Chelsea e-book their place within the FA Cup semi-final.
Christian Pulisic managed to rob two big alternatives to place the much-changed Blues out of sight, blocking some tense closing exchanges because the Blades get up from an hour-long submission to a threatening start.
David McGoldrick nodded extensive when not marked deep within the Chelsea space, a loss which proved to be a key reprimand for the Blues.
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And Ziyech capped a last-gasp counter-attack to seal victory and lay within the final 4.
Even within the midst of an ambient performance Chelsea nonetheless deserved victory, extending Thomas Tuchel’s unbeaten start to 14 video games.
Toothless for 60 minutes, the ‘Blades’ early chunk solely got here amid a string of pointless tackles, many off the ball, and a handful directed at Pulisic.
If the guests had invested a lot vitality dedicated to the darkish arts in attempting to perform their recreation plan in that opening hour, the tie may have been very totally different.
As a substitute Chelsea had been allowed to swing to victory as little as it was, escaping a number of late innings to ease into the final 4.
Boss Tuchel made 9 adjustments from the 2-0 Champions League victory over Atletico Madrid on Wednesday, with Billy Gilmour given a uncommon start in midfield.
The German was not happy with the performance, making a host of adjustments just after the hour mark in an try to inject some impetus into the Blues present.
However the difficult puzzle will definitely be glad with the outcome, particularly with extensive rotation serving to to manage the sport patch.
Chelsea went forward with out even registering a shot on target.
Chilwell drill ball into the world diverted off Norwood and into the Blades midfielder’s own net.
There have been few helpful alternatives within the first half of a cage and the guests fully wasted the point of their 4-4-2 formation.
A tactical change designed to take advantage of house behind the backs of Chelsea’s wing, the Blades didn’t even try these areas not to mention spoil the sidelines.
Chelsea had been completely happy to play the ball in entrance of the passive Blades, who additionally made a transparent function of not urgent their opponents.
Pulisic ought to have doubled the lead when sniffing in, however he could not dunk the ball excessive sufficient to beat the exceptional Aaron Ramsdale.
The United States striker wasted one other wonderful chance instantly after the break, seemingly shocked to stroll past two defenders and nonetheless get luggage of time when he got here by means of on goal.
All that time created a chance for contemplation and, as an alternative of crushing his laces by means of the ball, Pulisic went for a location however scratched his strike, permitting Ramsdale to bat away to security.
McGoldrick missed a gilt edge alternative for the Blades – their best opening – as Chelsea’s foot got here too far off the gasoline.
Oliver McBurnie then hit Kepa Arrizabalaga’s rails from close vary because the Blades lastly made Chelsea work.
Rhian Brewster flashed extensive when clicking on a second ball on the point of death, however Chelsea held on – and Ziyech even had time to seal their progress.