Линфилд
In 2000, Chelsea Headhunters formed a temporary alliance with other British hooligans supporting Linfield F.C., Rangers F.C., Cardiff City, Swansea City and Leeds United led by Arsenal's firm, The Herd, to attack Galatasaray fans in Copenhagen and Turkish fans in Brussels during Euro 2000 as part of revenge for the 2000 UEFA Cup semi-final stabbing of two Leeds United fans by a Galatasaray fan. Other allies were supporters of Lazio and Hellas Verona. Chelsea Headhunters 'top boy' ('top' indicating his position within the hierarchy of the hooligan gang) Jason Marriner also appears on a photo alongside Linfield hooligan Randy Ollins in Blaney's autobiography "The Undesirables" with a caption by Blaney commending the Headhunters on being one of the top firms, indicating a mutual respect between the Headhunters and West Ham United's Inter City firm.