And another one!

Marcus Forss is brought down by Kipre as he bursts into the box. The ref points, once again, to the spot.

The Bees turn to Ivan Toney to try and save them. He replaces scorer Marcondes.

Watford have conceded three goals in a League Cup match against fourth-tier opponents for the first time since September 1973 against Reading, a 3-2 defeat.

Biggest chance of the game. Jesse Lingard plays in a low cross, Donny van de Beek steps over it cleverly and Juan Mata forces a good diving save from James Shea.

Brentford aren't going away quietly. Marcondes swings in a free-kick and it takes two really good headers from Sam Field to clear the danger.

LemmeSpeak: If Mourinho started this 11 with 2 holding MFs against Luton, fans & pundits would rip him apart even before the start of the match

Image source, Getty Images

United defender Harry Maguire strolls forward as Luton's defence back off but his long-range shot is deflected wide.

John Southall
BBC Radio 5 live football reporter at London Stadium

The two players and the manager travelled to the ground with the squad, I'm told, in two or three separate coaches. They say they all social distanced, the squad, from when they met up and throughout the journey.

They arrived [at London Stadium] at 18:15 which is when the teams are put in - Josh Cullen and Issa Diop were in that team - but as soon as they arrived the results from the tests done yesterday came through and the two players and the manager were isolated immediately in separate rooms and left the ground very quickly, I'm told.

West Ham say they are satisfied nobody else in the squad needs to self isolate - and that is why the game has gone ahead.

The Bees respond to going behind again by sending on Christian Norgaard and Josh da Silva for Sergi Canos and Jan Zamburek.

The corner doesn't really come to anything. Not too much between these teams yet.

Corner to United as Jesse Lingard's cross is blocked.

Another one! Edwards is found in the box by Gallagher and his feet are too quick for Goode, who trips him.

West Brom test Raya as Phillips rifles a shot from range that is too close to the keeper and saved easily.

Oof. Luton's Andrew Shinnie leaves one in on the shinnie (sorry) of Brandon Williams. No booking and Williams is OK. It could have been a lot worse.

Two minutes between the two goals. After a tense, tight first half, this game has sprung firmly into action.

First chance of the game. Good play by the much-maligned Jesse Lingard to find Juan Mata, whose 20-yard effort is saved by James Shea.

Three minutes in and no goalmouth action. Dean Henderson has just had his first ever touch as a Manchester United player, dealing with a routine backpass.

Easy for the Hammers.