Juanjo replaced Ernesto Chevanton in the 57th minute of the game at San Mames, but could not prevent his side from slumping to their ninth league defeat of the season.
"I am happy for my debut but also sad for the result. The team have not played very well, Athletic have been better and this is why they beat us," said the 22-year-old striker, who felt things could have been very different if Sevilla had not spurned a great chance in the opening period.
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