New La Liga champions Barcelona tumbled to a 2-1 defeat to Real Sociedad on Saturday before receiving their trophy at a packed Camp Nou. Mikel Merino and Alexander Sorloth struck for the visitors, who defended their hold on fourth place, restoring a five-point gap on Villarreal, fifth, in the fight for Champions League qualification. Earlier, Villarreal snatched a 2-1 win at Girona through Gerard Moreno's stoppage time strike. Robert Lewandowski pulled one back late on for Barcelona, who clinched the title last weekend with a thumping 4-2 win at Catalan rivals Espanyol, and were given a guard of honour before the game.