West Ham's owners have apologised for the attack on Manchester United's team bus outside Upton Park and warned there will be consequences.
Co-owner David Gold suggested it highlighted the importance of the club's move to the Olympic Stadium, while David Sullivan vowed the club would ban any identifiable perpetrators for life.
A section of fans attacked Manchester United's bus as it approached the ground before West Ham's 3-2 win on Tuesday evening, the last game to be played at Upton Park.
Bottles were also thrown at visiting goalkeeper David de Gea during the match.
When asked on Wednesday if the trouble highlighted the importance of West Ham imminent move to the London 2012 athletics stadium, Gold said: "I think it does, doesn't it?
"You can see sadly what happened was we had a situation of having probably 45,000 fans and the infrastructure can't cope with it."
Speaking at the Telegraph Business of Sport Conference, Gold said: "It was clear evidence of what we've been saying all along - to fans that are saying 'We want to stay at Upton Park, let's develop it, we're only moving for other reasons, not footballing reasons' - you can't develop West Ham any further.
"It is completely at its capacity, 35,000 is all that it can cope with, and you saw that. There was 45,000 fans there and they gridlocked the East End of London. I'm sure the (overcrowding) was a contributing factor (to the violent scenes).
"The new stadium has got five train stations. What we had was tens of thousands of fans in the streets: you can't have that. Modern stadiums have all got overspill areas. Upton Park doesn't."
As well as bottles being thrown at De Gea, a fan invaded the pitch to confront the Spaniard.
Three men were arrested during the game, including a 20-year-old on suspicion of affray and a 47-year-old and 18-year-old for pitch incursion.
The Football Association has contacted both clubs for their observations and liaised with police as part of the ongoing investigations.
While Gold apologised for the attack on United's bus, he appeared unaware of the trouble inside the ground.
"We're all very, very sorry for what happened," he said.
"If we could have done anything to avoid it then we would have done, but it is outside of our jurisdiction, these are fans outside of our responsibility and inside the ground everything was perfect.
"But it's not an issue for us, because that was outside the ground, our job is to deal with the issues inside, and of course we did.
"We had a fantastic evening, the fans were so absolutely exemplary (inside Upton Park), a great evening of football: it's not often we beat the mighty Manchester United."
