In addition to Mr. Rathi's opinion, I wish to advise you with an option that can provide an opportunity for him to improve performance, provided your management is also willing to allow him time to demonstrate his commitment and complete all pending tasks. Alternatively, in another situation, you can extend the probation period for another three months in writing as follows:
Probation Extension Notification
"Dear Mr. ABC,
This is to inform you that your probation will be over on -----=====. Although you might have put in efforts in learning and performing the assigned tasks in the normal course, there are still gaps in performance that have been observed as 'Unsatisfactory.' These observations and feedback have been pointed out to you by your Head of Department from time to time.
Management has, therefore, decided to extend your probation period for another three months. Please note that your performance during probation needs to meet our performance standards. Therefore, you are advised to improve in the areas already discussed in detail with timelines; otherwise, it will not be possible to confirm you as a regular employee. (It would be best to include job details, areas, timelines, and targets here.)
We expect that you will take this in the right spirit and will pay attention to the expected level of improvements in the assignments.
For XYZ Ltd,
Authorized signatory."