A statement by the internal security ministry says Mukhtar Robow is not eligible to run for the leadership of the South West region because he is still under sanctions.
Robow is the highest-ranking official to have ever quit the al-Qaeda-linked al-Shabaab. He surrendered to the government last year after the United States cancelled a $5 million reward offered for his capture.
Robow announced his candidacy for the regional presidency this week.
For Android Mobile users Ilwareed Online has an App available on Google Play Store, with this App you can get the latest News and Political Analysis every minute.
Download Ilwareed Now.
Follow us on Twitter #ilwareed and Facebook #ilwareedonline