Match ends, Manchester United 0, West Ham United 0.
Manchester United dropped to fourth in the Premier League after being held to a goalless draw by West Ham.
The visitors had the better chances in the contest, hitting the post twice in quick succession through Mauro Zarate followed by Winston Reid's header.
Zarate dragged an effort wide in the second half and Marouane Fellaini forced Adrian into a smart save.
Striker Anthony Martial struck a shot narrowly wide as the hosts failed to break down West Ham.
Louis van Gaal's side have conceded just once at home in the league all season, but their problems lie at the other end of the pitch, where they found the target only once from 20 efforts against the Hammers. It meant they missed the chance to go second and take advantage of rivals Manchester City's 2-0 loss at Stoke.
It could have been worse, though, had midfielder Bastian Schweinsteiger been sent off for raising his arm at West Ham defender Reid in the first half - the incident went unpunished by the referee.
Fans unhappy with wayward Man Utd
Captain Wayne Rooney has borne the brunt of much of the Old Trafford fans' frustration this season, unhappy with the striker's contributions as well as the team's style of play.
The side managed a narrow 2-1 victory at Watford in their last top-flight game without him but this time they failed to break down a resolute West Ham defence.
Van Gaal's preference for a slow and patient build-up has now yielded five goalless draws in his side's past nine games in all competitions.
Martial, on his 20th birthday, was deployed as the furthest man forward and had chances in both halves, but failed to work Spanish keeper Adrian, while Jesse Lingard blazed wide late on.
A visiting goalkeeper at Old Trafford can generally expect to be kept busy, but only had one save to make from Fellaini's close-range shot, much to the dissatisfaction of the home support who booed their team off at full-time.
Reid leads way to a welcome shut-out
Prior to this game, West Ham boss Slaven Bilic had masterminded impressive away wins at Arsenal, Manchester City and Liverpool. The Hammers could easily have made Manchester United another scalp.
Sitting back for much of the game, they caused their hosts problems on the break as winger Victor Moses struck straight at David de Gea when through on goal early on.
But it was in defence that the visitors were most impressive, led by the central defensive partnership of Winston Reid and Angelo Ogbonna. Both players made seven clearances in the match - the most of anyone on the pitch.
In front of them, midfielder Alex Song made his first start of the season following injury and added bite, making seven tackles - more than any other player.
It was a welcome clean sheet for West Ham, who had gone nine games without one before this, but they have now gone five games in the league without victory.
Man of the match - Winston Reid
What they said:
Manchester United manager Louis van Gaal: "The most important thing is you dominate, create and you finish. Football is scoring goals. The first two basic aspects of football we have done. When you don't finish from a metre in front of an empty goal you can say nothing anymore."
West Ham boss Slaven Bilic: On the clash between Bastian Schweinsteiger and Winston Reid: "To be fair I didn't see it when it happened. At half-time they showed me and it's a clear red card. A straight red without any doubts.
"I said to the referee I can't blame him because he simply didn't see it and it happens. They were concentrating on the ball and I can't blame him no matter how disappointed we are."
Manchester United head to Germany on Tuesday (kick-off 19:45 GMT) almost certainly needing a win against Wolfsburg to stay in the Champions League, while West Ham host Stoke in the Premier League next Saturday (kick-off 15:00 GMT).
The stats you need to know
- Manchester United are unbeaten in their last 14 Premier League meetings with West Ham, winning 11 and drawing three
- United have kept nine clean sheets this season, the most in the Premier League. They racked up 11 in the whole of last season
- The Red Devils have lost just two Premier League home games in 2015, a joint-lowest along with Arsenal and Tottenham
- West Ham have taken 14 points from away games this campaign, having secured just 16 last season under Sam Allardyce
- 1de Gea
- 33McNairSubstituted forVarelaat 45'minutes
- 28SchneiderlinSubstituted forCarrickat 44'minutesBooked at 85mins
- 31SchweinsteigerSubstituted forDepayat 73'minutes
- 4SongSubstituted forObiangat 78'minutes
- 20MosesSubstituted forAntonioat 37'minutes
- 10ZárateSubstituted forJenkinsonat 88'minutes
- Mark Clattenburg
- Shots on Target
Second Half ends, Manchester United 0, West Ham United 0.
Offside, Manchester United. Michael Carrick tries a through ball, but Juan Mata is caught offside.
Attempt blocked. Michael Carrick (Manchester United) right footed shot from outside the box is blocked.
Attempt blocked. Chris Smalling (Manchester United) right footed shot from the right side of the six yard box is blocked. Assisted by Juan Mata with a cross.
Corner, Manchester United. Conceded by Michail Antonio.
Attempt blocked. Mark Noble (West Ham United) right footed shot from outside the box is blocked.
Attempt missed. Angelo Ogbonna (West Ham United) header from the centre of the box misses to the right. Assisted by Michail Antonio.
Substitution, West Ham United. Carl Jenkinson replaces Mauro Zárate.
Foul by Guillermo Varela (Manchester United).
Mauro Zárate (West Ham United) wins a free kick on the left wing.
Michael Carrick (Manchester United) is shown the yellow card for a bad foul.
Foul by Michael Carrick (Manchester United).
Mark Noble (West Ham United) wins a free kick in the attacking half.
Corner, Manchester United. Conceded by Aaron Cresswell.
Attempt missed. Jesse Lingard (Manchester United) right footed shot from the centre of the box is close, but misses to the right following a set piece situation.
Anthony Martial (Manchester United) wins a free kick on the right wing.
Foul by Angelo Ogbonna (West Ham United).
Attempt missed. Anthony Martial (Manchester United) right footed shot from the centre of the box is close, but misses to the right. Assisted by Memphis Depay.
Anthony Martial (Manchester United) wins a free kick in the attacking half.