Josef Zinnbauer announced his decision on his future with Raja Casablanca after an historic campaign.
The German coach led the Moroccan side to success in both the league and the cup without suffering a defeat.
Having been linked with a move to the Saud Pro League, the former Orlando Pirates has now confirmed his departure.
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"Dear Fans of Raja Casablanca," Zinnbauer said on Instagram.
"I promised you would hear it from me first. With mixed emotions, I announce my departure from this incredible club. Over the past year, we have shared unforgettable moments: an undefeated season, winning the league and the King's Cup. This journey has been extraordinary, and I am deeply grateful.
"I understand your sadness, but let's focus on the positive. This farewell is not forever; I believe our paths will cross again. Raja Casablanca, with its vibrant spirit and unwavering fan support, will always hold a special place in my heart.
"I am forever grateful to the kingdom, its wonderful people, my coaching staff, the fans, the entire Raja board and our players, my boys.
"You welcomed me with open arms, and I felt not only German but also Moroccan. Your warmth and support have deeply touched me.
"Some fans have misunderstood and strayed into disrespect, but this will not cloud my view of my time here. The majority of people in Morocco are respectful and appreciate what we have achieved. Raja has the best fans in the world, who treat opponents and those who have given everything for the club with respect.
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"It is hard to take this step, but I am confident my successor will continue our successes. I wish Raja Casablanca much success in the Champions League and beyond and will always follow the team's progress. My journey will lead back to Morocco when I can help the country and the team.
"I am grateful and happy to have lived this epic adventure. I look forward to seeing Morocco shine as the host of the Africa Cup next year and hope to visit my friends and colleagues here often.
"Take care and stay as passionate and strong as ever with a green heart
"In conclusion, I thank the Kingdom of Morocco, its wonderful people, and its wise, progressive, and kind-hearted King Mohammed VI and his promising son Moulay Hassan
"Forever yours, Joe"