8' West Ham are being kept penned back in their own half as United continue to close them down high up the field. The visitors are keeping the ball well, but they just can't find a way forward at the moment.
6' It's a good ball from Telles over the top to pick out Rashford's run ahead of him down the left and he brings it down well. He's quickly closed down by Coufal though and he can't keep it in play.
4' Greenwood closes Fornals down quickly to win the ball back and he drives forward into the box. He takes a heavy touch when he gets into the area though which gives Cresswell chance to clear the danger.
2' West Ham have a free-kick in midfield and Noble curls a good ball into the far post. He's looking for Yarmolenko, but Matic gets ahead of him and does enough to help see it out and avoid giving away a corner.
1' Noble gets the game underway for West Ham!
The teams are out on the pitch now, with kick-off just moments away.
West Ham haven't won any of their last eight away FA Cup games against Premier League opponents (D3 L5), since beating Manchester City 2-1 in March 2006 en route to reaching the final.
David Moyes makes just three changes to his team after their draw with Fulham last time out. Noble, Fornals and Yarmolenko start, as does Soucek after his red card from that game was rescinded. Benrahma is named on the bench, while Jesse Lingard is ineligible to face his parent club.
Ole Gunnar Solskjaer makes six changes to the side that drew with Everton at the weekend as he brings in Henderson, Telles, Matic, Fred, Van de Beek and Martial. Shaw, McTominay, Fernandes and Cavani drop to the bench, where new signing Diallo is also named as a substitute.
WEST HAM SUBS: Frederik Alves, Fabian Balbuena, Nathan Trott, Ademipo Odubeko, Said Benrahma, Ben Johnson, Issa Diop, Manuel Lanzini, Ryan Fredericks.
WEST HAM STARTING XI (4-2-3-1): Lukasz Fabianski; Vladimir Coufal, Craig Dawson, Angelo Ogbonna, Aaron Cresswell; Declan Rice, Mark Noble; Tomas Soucek, Pablo Fornals, Jarrod Bowen; Andriy Yarmolenko.
MANCHESTER UNITED SUBS: Brandon Williams, Edinson Cavani, Axel Tuanzebe, Bruno Fernandes, Amad Diallo Traore, Luke Shaw, Daniel James, Lee Grant, Scott McTominay.
MANCHESTER UNITED STARTING XI (4-2-3-1): Dean Henderson; Aaron Wan-Bissaka, Victor Lindelof, Harry Maguire, Alex Telles; Nemanja Matic, Fred; Mason Greenwood, Donny van de Beek, Marcus Rashford; Anthony Martial.
United saw off rivals Liverpool with a 3-2 win in the fourth round. They come into this game having lost just one of their last nine in all competitions (W5 D3), and did beat today's opponents 3-1 in the Premier League earlier this season. As for West Ham, they cruised past Doncaster Rovers with a 4-0 win last time out in the competition and also come into today on a good run, losing just one of their last 11 in all competitions (W7 D3).
Hello and welcome to live coverage of the FA Cup fifth-round meeting between Manchester United and West Ham at Old Trafford!