- N'Golo Kante strike after 51 minutes puts Chelsea into FA Cup semi-finals.
- Ander Herrera was sent off for two bookable offences inside the first half.
- Marcus Rashford led Manchester United's attack this evening despite reports claiming he was set to miss out due to illness.
- 19-year-old "put himself up" for selection, says manager Jose Mourinho.
- Semi-final draw to follow after tonight's match.
That's it! Chelsea join Arsenal, Tottenham and Manchester City in the FA Cup semi-final draw. The double is on for Antonio Conte.
Full-time: Chelsea 1-0 Manchester United
Costa's evening is over, Michy Batshuayi comes on for the final few minutes of this match. United look done here.
Smalling inexplicably gives the ball away in the Chelsea box and the Blues mount forward on the counter. It's Costa vs Jones while the Spaniard waits for reinforcements and it comes in the form of Fabregas. He lashed a shot from the edge of the box on goal but De Gea makes a good save with Rojo doing brilliantly to block up a follow up effort.
Four minutes of time added on. Four minutes for United to rescue something.
Moses hasn't looked right since that challenge from Young and Kurt Zouma is onto replace him for the final few minutes.
Chelsea continue to probe but Jones halts it with a clean interception, before flinging a ball upfield for Rashford to chase. It doesn't quite reach him, and play is brought back for a foul on the United defender from Costa, who is booked.
Chelsea go in for the kill again but Valencia comes to the rescue, completing a 40 yard sprint to make a crucial interception. Jose is running out of time here.
Six minutes of the 90 remain on the clock.
United venture forward with Valencia doing well down the right. He cuts back to Jones whose cross is overhit, but Lingard does brilliantly to cut it back across the face of the box to Pogba. He lines the shot up, but drags a meek effort wide. He has disappointed again tonight.
Here's a change from each side. Cesc Fabregas replaces Willian for the Blues while Jesse Lingard, who scored a superb goal here last season, is on for Young.
Now Young is booked. Moses does well to deny the United man's run down the wing and takes the ball off him, breaking down the same flank. Young isn't letting him go, however, slides in with an ugly challenge to bring him down.
Moments ago, Valencia brought down Hazard with a challenge far uglier than the one which saw Herrera sent off. No punishment for the Ecuadorian, however.
Chelsea should be two ahead. United are undone down the right with Willian jumping a challenge from Rojo to slide an enticing ball across goal. Costa is lying in wait but he cannot make contact with the ball as it flashes across goal.
Willian tries to catch de Gea out with a first-time strike towards the near post but the United goalkeeper is alive to it, punching away for a corner.
United are pinned in their own half at the moment. Rashford's effort proved Chelsea cannot afford to rest on a 1-0 lead and Antonio Conte knows this.
Costa and Rojo are involved in another incident with the Spain striker hitting the deck in dramatic fashion after the Argentine ran into him. The whistle had already been blown for offside.
Somewhere in the middle of all that is N'Golo Kante being mobbed by his teammates.
Costa appeals for a penalty after being felled in the box but it was an excellent challenge from Rojo, who hooked his leg across to nudge the ball away.
Willian close to a second! Kante has the chance to shoot from similar range but brilliantly dummies to send Fellaini flying. He shifts the ball onto Willian who curls one towards the top corner but it flies just over.
Chelsea burst forward on the counter, settling for a corner after an important block from Rojo. The ball reaches Costa who is unmarked in the box but he powers his header wide! What a chance.
Courtois saves Chelsea! It's brilliant from Rashford who capitalises on an error from Luiz and runs at Cahill, effortlessly wrong-footing the centre-half to break into the box. He tries to drill one low under the Chelsea goalkeeper but Courtois makes himself big to make a crucial save.
United still have Jesse Lingard and Juan Mata on the bench if Jose Mourinho feels another change is needed. Only problem is, his side can't get the ball off the opposition at the moment.
United are still not coming out despite slipping behind, inviting Chelsea to shoot from range. Azpilicueta obliges again, but again fires well over the bar.