Lukaku scores with header at far post
Matic heads second from Ashley Young's free-kick
Man Utd & Spurs through to semi-finals
Mourinho highly critical of his team after match
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Andrew: The two players Mourinho singled out in his 12 minute monologue yesterday score tonight. Genius!
Babatunde: It's not a convincing win for me, Man Utd not playing as expected. Mourinho has to change his style.
Manchester United 2-0 Brighton
Stephen Warnock
Ex-Liverpool defender at Old Trafford
Mourinho needed a result, they needed a win. And typical Mourinho he gets it. It may not have been in the way fans want, but he can say the team bounced back and that the team have a winning mentality. And so it has proved.
Manchester United 2-0 Brighton
Watch as Nemanja Matic heads home late on for Manchester United to secure a 2-0 win over Brighton in their FA Cup quarter-final at Old Trafford.
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Josh: Another dreadful performance, the result papers over the cracks. The only positive I can take from that as a United fan is we're through
Amogh: Football is as much a game of confidence as it is skill. People are deluded and need a reality check if United are expected to suddenly switch into another gear after the Sevilla debacle.
Manchester United 2-0 Brighton
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Manchester United 2-0 Brighton
Image source, ReutersJob done for Jose Mourinho and Manchester United.
In some horrible conditions, especially in the first half, goals from Romelu Lukaku and Nemanja Matic take United into a Wembley semi-final.
Professional and effective from the hosts. Brighton gave a good account of themselves in the second half and were left to regret Jurgen Locadia's missed header when unmarked, but it is United who advance.
Manchester United 2-0 Brighton
Pascal Gross tests Sergio Romero from 25 yards, but the goalkeeper is equal to it.
Manchester United 2-0 Brighton
Stephen Warnock
Ex-Liverpool defender at Old Trafford
Just looking at Brighton, their fans can be proud of the performance tonight having come all this way. They have given everything this second half and deserve more.
Manchester United 2-0 Brighton
Ashley Young seems to have recovered from his knock. He calmly brings down the box in his own area and takes a touch to give it to a team-mate.
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Colin: United winning ugly again! Brighton really deserved something from this as they've shown great ambition!
Sho: Really doesn't feel like we're winning 2-0 and going through to the FA Cup semis. Been another one of those "just about ok" performances, if that.
Three minutes left. Brighton need two goals.
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Jon: And that’s why Jose signs tall players. Why try and carve teams open with scintillating football when all you need is cross-head-goal?
Yaw: Thank goodness Young is on set pieces again. Quality way better than Rashford's!
Dharma: Matic is MOTM for sure. United have to improve if want to win the cup though
Image source, PAManchester United 2-0 Brighton
Ashley Young gets some treatment, but United say he is OK to carry on. Instead, Marouane Fellaini comes on for Jesse Lingard, meaning it is a day of inaction for both Paul Pogba and Alexis Sanchez.
Image source, ReutersMan Utd 2-0 Brighton
Simon Stone
BBC Sport at Old Trafford
Image source, Getty ImagesSo, it looks like Jose Mourinho is going be the first manager who might be asked about the potential for a Wembley semi-final against Tottenham.
Spurs' year-long stay at the national stadium while their new home is finished always had the potential to be controversial - and now Manchester United have a one-in-three chance of facing a last four encounter at Wembley against the team who play there all the time.
Manchester United 2-0 Brighton
Ashley Young looks to be in pain, who has gone down badly when trying to challenge Jurgen Locadia. No blame at all to the Brighton man, and Young fell badly on his back leg. Remember, he is in Gareth Southgate's squad for the friendlies against the Netherlands and Italy.
Manchester United 2-0 Brighton
Stephen Warnock
Ex-Liverpool defender at Old Trafford
What a ball from Ashley Young. Feeds it into a great area, takes the pace off the ball just to get the accuracy on the ball, and a great header from Nemanja Matic.
Image source, PAManchester United 2-0 Brighton
Brighton have been the better side in this second period but still find themselves staring down the barrel of an FA Cup exit.
Here is a clip of probably Brighton's best chance, which was headed wide by Jurgen Locadia on 66 minutes.
It was only 1-0 at this time, and this would have made it level.
Nemanja Matic (Manchester United)
That should be the game.
With their first chance on or off target in the second half, Manchester United double their lead.
Ashley Young's deep free-kick is headed into the net by Nemanja Matic, who set up the first goal for Romelu Lukaku. Not a pretty performance by United, but nearly job done.
Image source, ReutersThe snow is back in Manchester.
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PW: What are the chances of Utd having another shot on goal? Slim?
Karl: So many times we play all this tippy tappy football in the middle when we've got players on their own out wide. If only Scholes was on the pitch to pepper the ball to them. This game is screaming for a Scholes!
To be fair, most games are always screaming out for a Scholes.