Watch: Roy Keane and Jose Mourinho slam Manchester United's performance against West Ham
Roy Keane was "shocked and saddened" by how bad Manchester United were in their latest defeat while Jose Mourinho agreed there had been no improvements.
Andriy Yarmolenko had given West Ham the lead, before Aaron Cresswell finished United off with a stunning free-kick late on.
The Reds, who have finished in the top four just twice since Sir Alex Ferguson retired in 2013, have not won on their travels in the Premier League since February - a run of seven matches equalling an unwanted club record.
Former United captain Keane, who won 13 major trophies during his spell at Old Trafford under Ferguson, said on Sky Sports: "I was shocked and saddened by how bad they were today.
"They were lacklustre, no quality, lack of desire, lack of leaders, lack of characters. It's a long way back for United but scary how far they've fallen."
Former United boss Jose Mourinho, sacked by the club in December of last year, echoed Keane's words and admitted he did not have anything good to say about the visitors' performance.
He said on Sky Sports: "I can't find any positives. We were bad last season, but I don't see any improvement this season - even with three new players.
"I have to say, players with a positive impact. I like the three and I think they're bringing good quality to the team.
"But the team, as a team, I don't like at all. I'm not surprised by the result and I don't think Ole (Gunnar Solskjaer) can take many positives from the game."
United manager Ole Gunnar Solskjaer was told about Mourinho's comments in the post-match interview and said: "He's got the right to his opinion," before pointing out Mourinho's United also lost at West Ham last year.
"It was a game that could have gone both ways. The key moments, they grasped and we didn't. I have to say two fantastic finishes from two good left feet. And we didn't take our chances when we had them.
"It's one of those moments. We've historically had loads of centre-backs struggling with injuries over the years.
"At the moment it's the strikers. That's just how it's gone. Hopefully Mason and Anthony will be back for the Arsenal game, and at least one of them for Rochdale."
Meanwhile, former United defender Patrice Evra suggested on Instagram that he was willing to get involved to help his old club.
He posted: "I think it's time to get our hands dirty! Manchester United board, are you ready to let us help you guys?"
West Ham appeared to mock a song Manchester United fans sing about Solskjaer by posting a picture of their manager Manuel Pellegrini under the words 'at the wheel'.
West Ham United 2-0 Manchester United Opta stats
- After winning each of his first nine away games in all competitions as Man Utd boss, Ole Gunnar Solskjær has failed to find victory in his following nine (D3 L6).
- West Ham have won three of their last five Premier League home games against Man Utd (D1 L1), as many as they had in their previous 23 home games against them in the top-flight (W3 D11 L9).
- West Ham manager Manuel Pellegrini is the first manager to win a Premier League game against four different Manchester United managers (David Moyes, Louis van Gaal, Jose Mourinho and Ole Gunnar Solskjær).
- Man Utd have failed to keep a clean sheet in any of their last 11 away matches in all competitions, their worst run since conceding in 14 consecutive matches between April and December 2002.
- Man Utd have lost seven of their last 15 Premier League games (W4 D4 L7), as many defeats as they had recorded in their previous 40 matches in the competition (W25 D8 L7).
- Manchester United have named an unchanged starting XI in the Premier League for the second time this season - they didn't name a single unchanged side in this competition in 2018-19.
- Since the start of the 2011-12 season, Manchester United’s David de Gea has conceded more Premier League goals from direct free-kicks than any other goalkeeper (12).
- Felipe Anderson has been directly involved in 15 Premier League goals for West Ham since the beginning of last season (9 goals & 6 assists) - more than any other Hammer in that period.