Villarreal spoils Barcelona's LaLiga title party
Barcelona slumped to a 3-2 home defeat to Villarreal in its first game since being crowned LaLiga champion.
Hansi Flick's team sealed the title with a 2-0 victory over local rival Espanyol on Friday.
But perhaps suffering something of a hangover from their celebrations, the Blaugrana slipped up at Estadi Olimpic Lluis Companys, where Tajon Buchanan netted an 80th-minute winner for the visitor to snap Barca's 17-game unbeaten run in the league.
Villarreal took the lead inside four minutes, as Ayoze Perez coolly slotted beyond the returning Marc-Andre ter Stegen.
Teenage sensation Lamine Yamal hit back for Barca, which then led at half-time after Fermin Lopez finished on the back of Yamal striking the crossbar.
Villarreal, though, showcased its own powers of recovery in the second half, with Santi Comesana swiftly restoring parity.
That paved the way for Buchanan to latch onto Gerard Moreno's superb cross and nudge Villarreal into a lead it did not relinquish, as the Yellow Submarine confirmed Champions League football for next season.