West London derby been in the Football League for a longer period of time than Brentford and had stronger rivalries with the likes of West Ham United and Tottenham Hotspur, whereas Brentford's main rivals are Fulham and QPR. Also Brentford developed a bigger sporting rivalry with Arsenal at the time as both clubs vied for the title of London's number one club. The only bad feeling between the clubs was soon after Chelsea's foundation and admission into the Football League in 1905, the other West London clubs, including Brentford, lost many supporters and potential supporters to the only professional Football League club in
Supporters of S.L. Benfica Supporters of S.L. Benfica S.L. Benfica is a Portuguese sports club based in Lisbon, formed in 1904 in Belém by members of Associação do Bem (a group of former Real Casa Pia de Lisboa students), led by Cosme Damião. It has been part of the Portuguese football top-flight, Primeira Liga, since the league's inception in 1934. Most notably, they have won the Primeira Liga 36 times, 28 Taça de Portugal and 2 European Cups. The supporters of Benfica, who are called "Benfiquistas", have played an important part in the growth of the club, during the club's -year existence. One of