The popular presenter broke the news on Friday evening.
“28th September is my last day on Capital FM,” Kasujja posted on his Twitter account.
The news was received with shock.
Chimp Corps say this is a huge blow to Capital Fm.
Kasujja did not reveal his next move. Neither did he explain why he had chosen to say farewell to the Kamwokya-based radio station.
Fans quickly took to the social networking site to wish him good luck.
Evelyn tweeted: “Now my mornings won’t be the same again..It was nice listening to you every morning. All the best. “
Paul Lubega tweeted: “Alan, it’s been good having you and your team every other morning. Thank you! May the odds forever be in your favour. Good luck!!!
Kasujja has been co-hosting the show with Jackie Lumbasi and Ramesh Gablsing.