Hello, yes, more than likely
You cannot extend the employee's notice period without their consent. Once the notice period expires that would be the end of their employment, whether there is an outstanding disciplinary matter in progress or not. The timings are unfortunate but you cannot extend the notice period just to allow you to discipline them. So you would either have to accept that by the time the disciplinary could be held they will no loner be employed by the company, or if there is evidence that their reasons for absence are not genuine, you could consider holding the disciplinary in their absence, although be careful because you need some clear evidence that this is the case to do so
ok thank you again for your help!
no problem, all the best