Police are hunting for four West Ham fans after the attack on the Manchester United team bus.
Four police officers were injured in the disorder and kick-off was delayed by 45 minutes as a result.
Commander BJ Harrington said the police were working closely with both clubs to "bring the individuals to justice".
"I would urge anyone who recognises the men in these pictures to contact police," he said.
Footage posted on social media showed fans attacking the coach as it made its way on to Green Street.
Manchester United's players were seen taking refuge in the coach's aisles as objects hit the windows.
West Ham have vowed to issue life bans to any fans found responsible.
Three men have already been arrested over disorder inside and outside the stadium.
- Anyone with information have been told to contact the Public Order investigation team on 020 7275 4569
- Alternatively, contact Crimestoppers anonymously on 0800 555 111 or at crimestoppers-uk.org quoting the image reference number