Kick-off was delayed ahead of West Ham's final game at Upton Park as Manchester United's coach was delayed in entering the stadium.
As throngs of home fans gathered outside the ground, which will close following the game ahead of a summer move to the Olympic Stadium, United's coach could not get through after already arriving later than anticipated.
When it did arrive, a number of items were thrown from the group of West Ham supporters including bottles, and it was announced kick-off would be shifted from 7:45pm to 8:30pm.
With post-match celebrations expected to last for up to 45 minutes, the delay could mean fans do not start flooding back onto Green Street until 11pm.
United captain Wayne Rooney confirmed the coach had come under attack as it struggled to get into the stadium.
"The coach got smashed up but we'll just have to go and prepare and get on with our job," he told Sky Sports. "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."
West Ham co-chairman David Sullivan said both police and match officials had been "kind" to Manchester United by delaying the kick-off.
Sullivan seemed to blame Manchester United for not having arrived earlier, rather than point the finger at Hammers fans.
"Man United should have got here at 4pm," he said on Sky Sports. "They know it's our last game. They had the same problem at Tottenham a few weeks ago.
"I think the police and officials have been kind. I'd make them kick off at 7.45pm if I was in charge."
He continued: "I'm gravely disappointed, more for our supporters.
"What people forget is they've got trains and buses to get home and we've got a wonderful, wonderful show after the game for them.
"Many just can't stay any more."