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
2005–06 S.L. Benfica season for Benfica in the 20th minute, but Tiago Targino equalized a few minutes later. Simão put Benfica back in front with a deflected shot that beat Márcio Paiva, ensuring a third consecutive win that reduced the distance to the league leader to four points. After another interruption for international football, Benfica returned to competition with a Clássico against Porto. Despite Porto being the favourite to win, Benfica won 2–0 with two goals from Nuno Gomes. It was Benfica's first away win at Porto since 1990–91, when César Brito also scored a double. On the following Thursday, Benfica visited El Madrigal