Four Ajax fans have admitted their role in violence which saw pieces of pavement and wall hurled at police before the club's Champions League match with Tottenham.
Marvin Kerkhof, 29, Stefan Tromp, 34, Fahd Amri, 23, and Boy Patrick Calvin Fuchs, 28, pleaded guilty to affray at Highbury Corner Magistrates' Court on Thursday, police said.
The men, who are all from Amsterdam, have been remanded in custody until they are sentenced at Wood Green Crown Court, north London, on a date to be set.
Scotland Yard said they were arrested after Ajax fans began breaking up pieces of pavement and wall and throwing them at police and Spurs fans on Brereton Road before Tuesday night's game.
Three police officers were assaulted as they tried to intervene but they did not suffer serious injuries.
Four other men were charged in connection with separate incidents before Ajax's 1-0 victory in the first leg of the semi-final.
Tommie Arjen Van Der Woude, 26, of Amsterdam, was jailed for 10 weeks and handed a six-year football banning order after pleading guilty to affray at Highbury Corner Magistrates' Court.
Samuel Greenaway, 52, of Enfield, is charged with a racially aggravated public order offence and Mohammed Hassan Mohamoud, 40, of Amsterdam, is charged with possession of a Class B drug.
The pair have been bailed to appear at the same court on May 15.
Diego Van Der Leeuw, 30, of Amsterdam, received a caution for a public order offence and has been released under investigation after he was arrested for common assault.