<p>The Real Betis forward sustained the injury to his right knee during Sunday's 1-1 draw against Norway in a pre-tournament friendly and had to be helped off the pitch.</p><p>"<strong>Everyone is waiting for Ezzalzouli's test results to determine the severity of his injury and to know if he'll recover in time for the World Cup</strong>," said the source.</p><p>Morocco play five-time world champions Brazil in their opening match in East Rutherford on Saturday. They will also face Scotland and Haiti in Group C.</p><p>According to the source, team officials "<strong>need to wait 48 hours to know the details of the injury before taking a decision</strong>."</p><p>However, reports of Ezzalzouli being sidelined for three to four weeks, or even missing the World Cup entirely, were dismissed as "speculation".</p><p>Morocco also have concerns over the fitness of Manchester United defender Noussair Mazraoui, who hurt his shoulder in the game against Norway.</p>