Section 205.2 — Canada Labour Code: Employee’s duty to inform employer

An employee whose job functions have been modified, who has been reassigned or who is on a leave of absence shall give at least two weeks’ notice in writing to the employer of any change in the duration of the risk or in the inability as indicated in the certificate issued by a health care practitioner, unless there is a valid reason why that notice cannot be given, and the notice must be accompanied by a new certificate.