West Ham co-chairman David Sullivan blamed Manchester United for a delayed start at the last game at Upton Park, despite home fans attacking the visitors' team coach on arrival on Tuesday.
Manchester United's bus had to battle through throngs of West Ham fans gathering outside the stadium as they prepared to say goodbye to the stadium where the Hammers have played since 1904.
As the driver manoeuvred his way through the car park gates, the coach was pelted with glass bottles and other projectiles -- breaking and damaging the tinted windows -- with one police officer and a member of the public suffering minor injuries.
Man United requested the game be delayed 45 minutes so they could have equal pregame preparation time as West Ham.
Sullivan was unhappy that United's request was granted and blamed the Red Devils for arriving late.
#WHUFCvMUFC delayed until 8:30 after the Man United team bus is attacked by fans https://t.co/W50nX8nzCw pic.twitter.com/r443lRd3y9
- Telegraph Football (@TeleFootball) May 10, 2016
United were previously delayed for a game at Tottenham Hotspur on April 10 this season after leaving their hotel too late to navigate the London traffic.
"I'm gravely disappointed. It's more for our supporters. They have trains and buses. We have a wonderful, wonderful show after the match. Many fans will not be able to stay for that," Sullivan told Sky Sports, referring to a planned postgame celebration.
"Man United should have got here at 4 p.m. They made the same mistake at Spurs. I'd make them kick off at 7:45 p.m [as scheduled]. The police have been kind to them."
He denied on BBC radio that there had been any damage to the bus.
"There was congestion in the street, and they couldn't get the coach in. There were people around the coach, but there was no attack on the coach," he said. "If you check the coach, there won't be any damage to it."
About 15 minutes before the delayed kickoff, hundreds of West Ham fans were still outside the stadium, having mostly congregated around a 1966 World Cup sculpture featuring West Ham and England stars Bobby Moore, Geoff Hurst and Martin Peters.
Around 100 police in riot gear stood around in formation and watched, with at least half a dozen officers on horseback. The street was littered with smashed bottles.
A Metropolitan Police statement said, "We are aware that a number of items were thrown towards Manchester United's coach this evening, Tuesday, 10 May. One police officer and a member of the public sustained minor injuries. There have been no arrests. An appropriate policing plan is in place."
West Ham are moving to the Olympic Stadium next season.
The Football Association issued a statement condemning the bus attack as well as fans who throw bottles on the pitch after a Man United goal in West Ham's 3-2 win.
"The FA strongly condemns the unsavoury incidents this evening involving both the Manchester United team coach outside West Ham United's Boleyn Ground and objects thrown from a section of the home support during the game," a statement said.
"We will work closely with both clubs and the Metropolitan Police to fully investigate these matters."
Once United were safely inside, Wayne Rooney said: "The coach got smashed up, but we'll just have to go and prepare and get on with our job.
"It's not for me to say, I'm sure you'll see. I'm sure West Ham will be disappointed with their fans.
"We know what we have to do starting with tonight. West Ham are a good team."
Man United manager Louis van Gaal expected fans responsible for damaging the bus to be held accountable.
"The images tell everything," he said. "I have seen also the police were taping.
"It is also a lot of emotions for people, but for us it is the second time in London we have to start later. It's better than last time because we have received our preparation time.
"It is not the first time I have seen that. It is not so nice. The way we have been received is not the proper way, of course. That makes all the influence on the players and that is a pity."