Atletico Madrid drew 1-1 with Real Sociedad to finish third in La Liga and Sevilla ended in fourth place.
The Spanish Cup final between Real Sociedad and Athletic Bilbao was originally scheduled for April 18 in Seville at the Olympic Stadium, known as La Cartuja.
La Liga proposed Barcelona, Real Madrid, Sevilla and Real Sociedad will qualify for the Champions League.
With coronavirus wrecking havoc with the football calendar, Copa del Rey final has been postponed.
Copa del Rey 2019-20: Real Sociedad took a step towards the final with a 2-1 win over second division Mirandes.
Athletic Bilbao captain Iker Muniain scored as they edged out Granada 1-0 in the first leg of Copa del Rey semi-finals.
Athletic Bilbao and Real Sociedad pulled off a shock Basque double to knock out Barcelona and Real Madrid from the Copa del Rey.
New rules of Copa del Rey say that lower division team in a tie hosts the match accordingly.
Copa del Rey 2019-20: Lionel Messi scored a brace as FC Barcelona made the quarter-finals with a 5-0 win over Leganes.
Copa del Rey 2019-20: Real Madrid had four different scorers as they thrashed Real Zaragoza 4-0 to reach quarter-finals.
Real Madrid have been drawn against Zaragoza while FC Barcelona will play Leganes at Camp Nou in the Copa del Rey last 16.
Copa del Rey: Real Madrid beat Unionistas de Salamanca 3-1 while FC Barcelona registered a 2-1 win over Ibiza.
Barcelona paid their players more last season than what they have given for winning the treble in 2015.
Ernesto Valverde was heavily criticised by fans on social media as Barcelona lost to Valencia in the Copa del Rey final.
FC Barcelona's La Liga-winning season ended in a disastrous fashion with humiliating losses in Champions League and Copa del Rey.
Barcelona will face Valencia in the final of the Copa del Rey, with hopes of soothing European disappointment.
From the next season onwards, Copa del Rey will be a single match format except the semi-finals while the Spanish Super Cup will be a four-team competition.
Midfielder Casemiro said Real were already looking forward to Saturday's rematch.
Goalkeeper Thibaut Courtois said on Tuesday that he believes Real Madrid can win a fourth consecutive Champions League title this season.
Neither Lionel Messi nor Gareth Bale were named in the starting line-ups for this first leg but their replacements filled the void as Malcom's curling shot cancelled out an early opener from Lucas Vazquez.