Lionel Messi of FC Barcelona celebrates with teammates after scoring his sides second goal during the Liga match between Deportivo Alaves and FC Barcelona at Estadio de Mendizorroza on July 19, 2020 in Vitoria-Gasteiz, Spain.
La Liga champions Real Madrid signed off with a 2-2 draw at Leganes, which saw the hosts relegated.
Leganes had to win to stand a chance of overhauling Celta Vigo, whose draw at Espanyol proved enough to keep them up by a point.
Los Blancos - who had secured the league title on Thursday - took the lead through a header from captain Sergio Ramos.
Bryan Gil equalised just before half-time, but Marco Asensio put Real back in front early in the second half before Roger Assale's 78th-minute goal set up a tense finale, but there was to be no late drama.
Zinedine Zidane's men will be back in Champions League action next month against Manchester City, trailing 2-1 from the first leg of their last-16 tie.
Lionel Messi secured the golden boot once again with a brace as Barcelona finished the La Liga season with a 5-0 win at Alaves.
The Argentina forward took his tally to 25 with a goal in each half after teenage forward Ansu Fati had opened the scoring in the 24th minute.
Luis Suarez made it 3-0 just before half-time, with defender Nelson Semedo - one of just five substitutes named on the bench - adding a fourth just before the hour and Messi completing a comfortable victory with 15 minutes left.
Barcelona will next be in action when they play Napoli in the second leg of their Champions League last-16 tie on 8 August, which is level at 1-1.
Elsewhere, Gerard Moreno scored twice during the closing stages as fifth-placed Villarreal beat Eibar 4-0.
Santi Cazorla was given a standing ovation as he went off late in what was the former Arsenal winger's final LaLiga appearance for the Yellow Submarine, while captain Bruno Soriano entered his retirement with a win.
Atletico Madrid finished third after a 1-1 home draw against Real Sociedad, with Adnan Januzaj's late goal securing a point for the visitors who finished sixth.
Granada - on their return to the top flight this season - secured seventh place and the chance of Europa League qualification after a 4-0 win over Athletic Bilbao as Getafe missed out following a 2-2 draw at Levante - where defender Coke scored a late equaliser.
Sevilla beat Valenica 1-0, as Los Che saw their European hopes ended. Real Valladolid had earlier defeated Real Betis 2-0 while Osasuna drew 2-2 against relegated Mallorca.
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