Regragui was speaking after Brahim's superb performance in Morocco's Africa Cup of Nations quarterfinal win against Cameroon.
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He has scored five goals in five matches, and on Friday night he helped send Morocco to the semi-finals with a 2-0 victory over Cameroon.
Regragui said afterwards: "He can become the best player in the world.
"Of course he is today my team's X factor.
"I would like to say congratulations to him because he now understands what it means to have Moroccan blood: to run, to fight and to give what you have."
Morocco will meet the winner of today's clash between Nigeria and Algeria in the semifinal.