Lionel Messi said Barcelona were guilty of playing like children on Thursday after Atletico Madrid staged a thrilling comeback to beat them 3-2 and set up a Spanish Super Cup final against Real Madrid.
Barca looked on course for a Sunday showdown against Real when they led 2-1 with nine minutes left but instead it will be a Madrid derby in Saudi Arabia to decide who lifts the trophy.
"It's a shame because we switched off for a few moments and made children's mistakes," Messi said. "We should have closed out the match.
"It's a blow for us, especially as we were the better team. Our mistakes cost us dearly."
"We made mistakes in everything, in passes - I think I missed a pass to Sam (Umtiti) before they scored - and the little things can lose you a match, a league, a Champions League."
- 'Instability' -
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