Valencia midfielder Pablo Aimar was discharged from hospital on Sunday after spending the night under observation after a blow to the head but has been ruled out of next week's Champions League match at Inter Milan.
"Aimar will undergo further tests during the week to monitor his condition," Valencia said on their website. "He is out of the match against Inter Milan."
The Argentine international collapsed two minutes into Valencia's 1-1 draw against Atletico Madrid at the Mestalla after being accidentally kicked in the face by defender Pablo Ibanez as he dived to head a ball.
"He suffered a complete loss of consciousness, was unable to breath properly for a short while and remembers nothing about the match," club doctor Jorge Candel told Radio Marca.
Valencia, who lost 5-1 to Inter at home two weeks ago, meet the Serie A side in a Champions League Group G match at the San Siro on Tuesday.
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