Three minutes of injury time by the way...

Michael Duberry
Former Leeds defender on BBC Radio 5 Live

So unlucky for Rhian Brewster. The shot had so much power. How did it not fly in the back of the net!

THIS WAS IT! Chelsea can't clear and Rhian Brewster thumps a low shot inches past the post. No wonder his head is in his hands. Soooo close. But they have a corner...

One last roll of the dice for Sheffield United. Lys Mousset on...

Is this it? George Baldock in space on the right, a couple to aim at in the Chelsea box... clunks it long.

Are Sheffield United going to get another chance? This was their best one...

George Baldock's hand catches Hakim Ziyech in the face as they tussle on the Chelsea left flank. Nothing sinister, just a good old battle.

Ziyech goes down though and isn't in a hurry to get up...

Michael Duberry
Former Leeds defender on BBC Radio 5 Live

Things have just fizzled out a bit for Sheffield United now. They are still huffing and puffing, but with nothing there. Chelsea can take a big sting out of this game and just really, really deflate them - take the wind out of their sails.

FIVE MINUTES TO GO!

Sheffield United have battled valiantly, but time is running out...

Chelsea have managed to stifle the visitors somewhat in the past few moments. More of the ball is now in the Blades half.

You know you're in a bit of bother when you need to go for the premium insurance policy that is N'Golo Kante. Thomas Tuchel waves some fingers in the Frenchman's face. He knows what to do. Shore it up, man.

Off goes Christian Pulisic. Presumably to get some ice on his bruised ankles.

Here is how close the Blades have come to being level at the Bridge...

Michael Duberry
Former Leeds defender on BBC Radio 5 Live

Sheffield United are all of a sudden on the front foot and Chelsea, they have to think a little bit more. Balls are being cleared and not passed. Sheffield United need to keep this momentum up.

John Arundell: Chelsea are playing in third gear and showing no urgency for second goal. Wow nearly punished by Utd, need to move up a gear and put it to bed.

Gary: These Chelsea subs are all strange. 4 full-backs (James, Azpi, Chilwell and Emerson) all on the pitch at the same time, and no recognised striker. Bizarre!

Paul Heckingbottom has flung on another striker by the way. Why not? Rhian Brewster - a former Blues academy kid - comes on for Oliver Norwood.

Chance! Enda Stevens arrives at the far post to meet the free-kick but can only head into the side-netting.

How are your fingernails, Chelsea fans?

Wonderful skill! David McGoldrick shows strength and desire to skip past Cesar Azpilicueta on the left flank like the Chelsea skipper is invisible. McGoldrick crosses but Jayden Bogle can't quite stretch to get there.

But the ball runs loose and the Blades win a free-kick on the right...

Didn't see the game turning into a proper contest, I must say.

Fifteen minutes for Sheffield United to force an equaliser and potentially take the game into extra-time.

Time for a Sheffield United change now as they throw more caution to the wind.

It's an Oliver twist.

Burke on for McBurnie.