Barcelona head coach Ronald Koeman defended Samuel Umtiti after the defender made errors on both of Sevilla's goals in Wednesday's Copa del Rey match.
Jules Kounde dribbled straight through Umtiti in the first half on the way to scoring Sevilla's opener, while Umtiti kept Ivan Rakitic onside before the Croatian scored his side's second in the 85th minute against his former club.
Sevilla won the semi-final first leg 2-0, leaving Barca with plenty of work to do in the second leg at Camp Nou on March 3.
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What Koeman said about Umtiti
"We left a lot of space in the first goal, not just in defence, but from the midfield," Koeman told a press conference after the match.