Valencia coach Marcelino suggested that he is running out of patience with Michy Batshuayi after substituting the on-loan forward during a shock Copa del Rey defeat to Sporting Gijon.
Los Che were humbled 2-1 by the Segunda Division side on Tuesday, leaving them with some work to do in next Wednesday's last 16 second leg.
Dani Parejo scored the away team's only goal, while Valencia's forward pairing of Kevin Gameiro and Batshuayi both drew a blank.
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The Chelsea loanee was given only 45 minutes before being substituted, in a decision Marcelino defended as "tactical" after the final whistle.