Michael Olaitan's agent has confirmed the striker, who collapsed during the Athens derby, is not suffering from anything serious.
Olympiacos' hopes of an unbeaten season in the league ended when they were unexpectedly beaten 3-0 by Panathinaikos.
Round-up: Olympiacos Piraeus face an uphill battle to reach the knockout stages following a 78-74 defeat at Fenerbahce.
Greece coach Fernando Santos said on Friday it was with a "heavy heart" that he had made his decision to step down after the World Cup.
Fernando Santos will step down as Greece coach after the World Cup finals, the Greek FA said on Thursday.
Braga coach Jesualdo Ferreira has left the club by mutual consent after only seven months.
CSKA Moscow rolled out the red carpet for Maccabi Tel Aviv coach David Blatt before mauling the Russians 100-65.
A round-up of all the weekend's action across the continent, with Spain's big three all winning.
Barcelona, Real Madrid and Atletico Madrid remained locked together on 60 points at the top of La Liga after Spain's leading trio won again at the weekend.
Former double Euroleague champions Barcelona made it six wins out of six with a 80-70 win over Emporio Armani Milan.
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