The 1989–90 season was Sport Lisboa e Benfica's 86th season in existence and the club's 56th consecutive season in the top flight of Portuguese football, covering the period from 1 July 1989 to 30 June 1990. Benfica competed domestically in the Primeira Divisão, the Taça de Portugal and the Supertaça, and participated in the European Cup after winning the previous league.

After only winning the Primeira Divisão, Benfica disputed the Supertaça, winning it for the third time. The league campaign was another controversial battle with Porto, who finished four points ahead of Benfica. Magnusson won the Bola de Prata. With attentions set on the European Cup, Benfica reached the final after defeating Marseille in the semi-finals. In the seventh European Cup Final, Benfica lost for a fifth time, prolonging Guttmann's curse.

The new season saw the arrival of Sven-Göran Eriksson for a second term. After Benfica won the 1988–89 Primeira Divisão in 7 May 1989, Eriksson confirmed that he would take over Toni's job only three days later. In the transfer window, Benfica lost Shéu and Mozer, with the first retiring and the latter moving abroad. To replace him, the club hired Brazilian defender Aldair and Swedish midfielder Jonas Thern. Eriksson started working on 28 July with Benfica travelling to Netherlands the following day for a two-week tour. They competed in the Rotterdam Tournament in early August and had their presentation game against Spartak Moscow on the 15. They then won the Trofeo Cidade de Vigo and had a late friendly with Varzim, postponing the league opening game.

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