S.L. Benfica 2015, Benfica reported to have 246,401 members; however, after a scheduled renumbering by the club in August 2015, the number decreased to 156,916. In April 2017, Benfica reported they had a total of 184,264 members by 31 December 2016. Benfica has rivalries with Sporting CP and FC Porto, with whom it forms the "Big Three": Portugal's most decorated clubs. None of them have been relegated from the Portuguese league since its establishment in 1934. As Lisbon-based clubs, Benfica and Sporting have shared a rivalry for over a century; it all started in 1907 when eight prominent Benfica players defected to
FC Porto in international football competitions decide the match 8–7 for Porto and give the club their second and last title in this competition. Despite the managerial instability – Fernández was replaced by José Couceiro soon after their Champions League elimination – and weak performances in league matches, Porto finished runners-up to Benfica and secured qualification for the 2005–06 UEFA Champions League group stage. Dutch coach Co Adriaanse was appointed as the new coach for the 2005–06 season, and although his team delivered domestically – reclaiming both Portuguese league and Cup titles – it disappointed in the Champions League, as Porto finished last of their group,