1983–84 S.L. Benfica season left the club in second, a point shy of the leader Porto, their next opponent. In the Clássico, Benfica beat his rival Porto and assumed first place. Later in the month, Benfica defeated Olympiacos in the second round of the European Cup, qualifying for the quarter-final. In November and December, Benfica won all their league matches, but lost the Supertaça Cândido de Oliveira to Porto. Benfica kept on winning in the Primeira Divisão in January, lapping the first part of league with a three-point lead. However they suffered a set-back in the Taça de Portugal, losing 2–1 in Estádio de
1983–84 S.L. Benfica season and Michael Manniche. Benfica started the season by winning the Portuguese Cup Final of the past season and the Iberian Cup. In the league, Benfica started strong until their drop points in October. A home win against Porto propelled them into first place, which they never lost. Twelve consecutive wins followed until they were stopped in February. In March, Benfica was knocked out of Europe and lost for the first time in the league. They reacted with five wins and a draw in the next month, before losing for a second time in late April. In May, Benfica confirmed their