The Whites failed to take their opportunities in the first-half which allowed Arsenal to claim a 2-0 victory with second-half goals.
"The first half we had a tendency we couldn't continue in the second half and this made it difficult," said Bielsa.
"When you go on and miss chances, it always gives the feeling to the opponent they can alter the result themselves.
"When you are behind it increases the problems, those are aspects a good team needs to overcome."
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