(Reuters) -Real Madrid manager Carlo Ancelotti lamented his side's costly errors as they squandered a two-goal lead to allow Barcelona to a rollicking 4-3 win in on Sunday, a result that left the Catalans one win away from claiming their 28th LaLiga title.

The Italian tactician, normally a picture of sideline serenity, could only shake his head as his injury-ravaged defense struggled against Barcelona's relentless assault at a sold-out Montjuic Olympic Stadium.