Barcelona coach Hansi Flick has pointed to fatigue and a string of costly errors as the key reasons behind his side's 4-2 defeat to Paris Saint-Germain in the UEFA Champions League on Wednesday — a result that brought an end to the club's perfect start to the season.

Flick acknowledged that his squad looked drained during the match, and that the mistakes they produced were simply too numerous to overcome against a side of PSG's quality. The loss snapped what had been a promising unbeaten run for Barcelona heading into the European campaign.

The defeat serves as a sharp reminder of the fine margins at the top of European football, where even a brief dip in concentration can prove decisive. Barcelona now face the challenge of regrouping and steadying their campaign before further Champions League fixtures.