Generally for more than 2 days many companies would ask for a medical report. You can do that. As he had joined 6 months back, you can speak with his supervisor/manager and issue a written warning letter/put him PIP program. Also speak with his reportees and take a feedback on his performance and how good is he as a team player. Beware he might as well look out in this period.
14th October 2016 From India, Bangalore