Chelsea has launched a probe after hundreds of away match fans had infiltrated the home end for the conference certification match on Thursday.
Supporters of the Swedish side Djurgarden were able to buy tickets in almost every part of Stamford Bridge for the semi -final second stage.
Police officers and stewards had to intervene to keep peace during the game, who won Chelsea 1-0.
Chelsea claims that he is illegal ticket sales and goes digitally with the seat of seats next season in an attempt to beat the touts.
The visiting supporters made no attempt to stay anonymous and sang loudly during the 90 -minute match.
Images from the inside of the night show that part of Stamford Bridge is completely taken over by visiting fans, where Chelsea saw an update during the game and relocate fans in the affected areas.
A fan put on a video with fans who collide with the Matthew Harding stand of the stadium during the competition, with another who show fans who are in the west collaboration during the break.
After the game, the confidence of the Chelsea supporters released a damn statement and asked fans to come up to present evidence for a formal investigation.
The statement said: “During the UEFA Conference League vs. Djurgården on Thursday, a large number of supporters could infiltrate large parts of the home side.
“This is the most serious violation of the stadium security in recent memory, and it considerably undermines all security protocols Chelsea FC that is set before the fixture.
“As a result, the confidence of Chelsea's supporters will formally write a complaint letter to the COO of Chelsea FC and head of security.
“We will call a formal investigation by the club into the ticket sales process and the security reaction of Chelsea FC during the competition.
“The findings of this investigation and any subsequent recommendations must be made available to supporters.
“The CST invites all supporters from who attended the fixture on Thursday to submit written, photographic and video evidence that they recorded during the fixture.
“The CST will then collect this evidence and then submit it to Chelsea FC.”
A Chelsea statement was: “We will look at all ticket schemes after the competition of this evening and commit to making all necessary changes after this assessment.
“We will also share all our findings with the Fan Advisory Board.”
Large numbers of police were in service because they were in the previous round when the notorious Legia Warsaw Ultras also gained access to home sections on the ground.
Chelsea's own chairman Todd Boehly has an interest in the US established vibrant seats, an unauthorized ticket resale site.
A police spokesperson said: 'Officers were deployed last night to support stewards at Stamford Bridge after a number of away match fans were identified in home standards.
“The fans had bought tickets, but not for the right part of the ground.
“A number of away match fans who had been in the home stands climbed in the designated weightlife where they stayed without incidents.
“Where away fans remained in home areas, officers and stewards offered a visible presence to ensure that any incidents or quarrels could be tackled.
“Although there were six arrests outside the ground for various violations, including mistreatment and possession of drugs, there were no arrests in the ground.”
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