Brondby promise action after Rangers fans attacked as Danes 'strongly dissociate' from thuggish scenes
Visitings fans have also been accused of attempting to enter the arena without valid tickets.
Brondby have promised to take action after hardcore Danish fans accosted Rangers supporters in the VIP section.
The Europa League clash was marred by issues, with fans forced to queue for just two entrances to the stadium.
Local police were also accused of striking them with batons before Steven Gerrard 's side drew 1-1 to keep their qualification hopes alive.
The scenes were slammed by Ibrox legend Derek Johnstone, who was sitting in the section when a group of hooligans accosted Rangers fans.
And Brondby have now promised to take swift action against anyone identified as one of the troublemakers.
A statement said: "Rangers FC were awarded the obligatory five percent of the stadium capacity, and the away section was immediately sold out.
"In addition to the 1,400 tickets, Rangers fans were not allowed to get tickets to other sections of Brondby Stadion but, despite constant communication from our side, we have had to go in and cancel several hundred tickets over the last week. We have, on several occasions, reached out to Rangers FC about this security risk.
"Before the start of yesterday's match, more than 500 Rangers fans were turned away at the entrances to Brondby Stadion with invalid and fake tickets, just as the ticket barriers and the gates to the away section were tried several times up to the opening of the stadium by Rangers fans.
"We had a really good and constructive collaboration with the police yesterday, in what was a very unusual and difficult task.
READ MORE: Derek Johnstone reveals Rangers fan terror at hands of Brondby thugs as legend blasts most 'disgraceful behaviour' he's ever seenREAD MORE: Ryan Kent ready for Rangers start as rejuvenated star makes 'raring to go' declaration"We would also like to thank our many hundreds of stewards at the stadium for making very thorough checks of fans, which helped to ensure that only those with tickets came in, despite the fact that several Scottish fans had worn Brondby IF jerseys and scarves.
"However, it is by no means acceptable for a group of Brondby fans to get into fights in the stands.
"We strongly dissociate ourselves from such behaviour, and we are now embarking on reviewing all video footage from the match in co-operation with the police so that we can identify the people involved and secure sanctions, including bans."