Family and friends say they are growing increasingly anxious for the 33-year-old.
The PSNI say Michael aged 33 has not been seen since January 9th.
When last seen, he was wearing a green jacket, grey jumper and black pants.
"Michael is 1.8m (5'11") tall with dark hair and a beard.
Flyers are also being distributed in the Boucher Road and Lisburn Road areas of south Belfast after some suggestions Michael may have been in those areas prior to his disappearance.
Anyone with any information is asked to contact Musgrave Police Station on 0044 28 9065 0222.