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
1992–93 S.L. Benfica season in a replay match in Lisbon, which Benfica won 2–0 with goals from Isaías and Sergei Yuran. Over the following months, Benfica had their best period of the season. Nonetheless, March was a difficult month as the team marginally defeated Sporting CP at home after dropping points in the title race against Farense, and were knocked out of the UEFA Cup by Roberto Baggio's and Gianluca Vialli's Juventus. In early April, Benfica closed the gap to leaders Porto to one point, after a hard-fought away win against Boavista. Ahead of the "Clássico" on 17 April, Porto and Benfica were tied