Chelsea have issued a complaint to UEFA after some of their fans alleged they were subjected to "brutality" from stewards and police at their Champions League match in Barcelona.
The Premier League champions said after the encounter in March that "a number of Chelsea fans were hurt" in incidents outside Camp Nou prior to kick-off.
After conducting an internal investigation, Chelsea released a statement on Friday to confirm a complaint has been filed with European football's governing body.
"Following the match, we issued a plea for information to those fans who may have been involved in these incidents," the Chelsea statement said.