In the European Cup, the team reached the semi-finals where it was eliminated by Western German side Hamburg SV. Despite winning 2–0 in Madrid, the squad plummeted in the second leg of the series to lose 1–5.[7] Meanwhile, in the 1979–80 Copa del Rey the squad advanced to the final and won the trophy against its reserve team Real Madrid Castilla[8] 6–1 in front of 65,000 spectators at the Santiago Bernabéu Stadium.[9]
The club clinched its 20th League title which became its third three-peat ever[10] by just one single point above runners-up emerging Real Sociedad[11] after the then-undefeated in last 38 league matches basque side lost its game on round 32 against Sevilla thanks to 2 goals of Daniel Bertoni.[12] Added to its Copa del Rey trophy, the team won its third "Double" ever.
Squad
Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply. Players may hold more than one non-FIFA nationality.