The Montpellier playmaker had been suffering with an adductor injury picked up last week.
His fitness is a huge boost for Morocco, who have hopes of going far in the tournament.
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The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.
Five English clubs will compete in the last sixteen of the Champions League for the first time ever as Liverpool, Manchester United, Manchester City, Chelsea and Tottenham face some difficult away matches.