Chelsea have submitted a complaint to UEFA regarding the treatment of their fans during their Champions League last-16 second-leg defeat in Barcelona.
Following the 3-0 defeat in the Nou Camp - which saw the Blues exit the competition - Chelsea appealed to their supporters to contact them with information after reports that some of them were hurt outside the stadium.
The club have now sent a report to UEFA, in which they accuse stewards and police of "brutality" towards their fans.
A Chelsea statement read: "Following the match, we issued a plea for information to those fans who may have been involved in these incidents.
"This resulted in an unprecedented response, with a large number of individuals coming forward to complain in relation to poor organisation, lack of crowd control, brutality on the part of stewards and police and exposure to generally unsafe conditions.
"Chelsea FC takes the safety of our fans, both at home and away, extremely seriously, and this is not what we expect when attending events organised by UEFA or its member clubs.
"We thank those supporters who shared their experiences to help form our report and will now await a response from UEFA."