Yes.
The time limit of one month for alleging serious misconduct is suspended during the period covered by a medical certificate and starts running again when the employee resumes work or on the expiry of the 26-week period of uninterrupted sickness.
Examples
In the event of serious misconduct on the part of the employee on 22 May 2018. The employee is on sickness leave from 1 June to 30 June 2018.
The period of one month is suspended during the period of sickness (the month of June) and recommences on 1 July, expiring on 22 July 2018.