Charlton Athletic chairman Michael Slater is to complain to UEFA after being attacked by Spanish police before Manchester City's 3-2 Champions League defeat at Real Madrid last month.
Slater, in Madrid as a City fan, was left with minor head injuries and severe bruising after baton-wielding police officers charged at City supporters close to the Bernabeu.
He has since been identified on amateur footage as being knocked unconscious in the unprovoked attack, which lasted several minutes.
Slater has already spoken to the Football Association's head of security and is set to provide a formal statement so that the matter can be taken to UEFA.
"I can confirm that I was assaulted by at least one police officer in Spain without any provocation at all," Slater told Goal.com. "I have been in contact with the FA and I am expecting them to take the matter up formally with UEFA."
Slater, a retired solicitor who was appointed as Charlton chairman in December 2010, is keen to take a stand in the interests of fans' safety when travelling abroad.