Dear Swarnas,
There are many ways to deal with employees when the management has decided to terminate him/her like performance, integrity, job rotation, transfer, health, absenteeism, safety, confidentiality, under probation period etc.
1. First try to find out what kind of accident it is and the severity of it. What is the normal time for recovery.
2. If you found any suspicious, check whether he is hospitalized or resting at home.
3. If he is at home, do a recheck through a different doctor in your presence which will establish the facts for further course of action.
4. If it is decided to remove him due to the performance issues, wait till he resumes the office. Show him his past performance ratings and appraisal records (but your communication says several months). If he is below achieved for past 2-3 years you may ask him for his resignation. But do it in front of his reporting manager and also check your policy on PMS before acting. Do not stop his salary till the F&F Process.
Regards,
PS