The 29-year-old midfield player suffered concussion during Porto's Portuguese Cup fixture against Vitória SC in Guimarães on Wednesday. He has been effectively ruled out of next Tuesday's UEFA Champions League visit of Paris Saint-Germain FC, although his injury is less severe than initially feared.
A club statement said: "Costinha suffered a knock to the head and temporarily lost his senses during the match against Guimarães. After the incident the player had a cerebral scan and further examinations on his head and spine. No major injuries were detected and he has a good chance of making a full and speedy recovery."
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