Can i know why he has to serve a notice period of 2 months..

If his roles & responsibilty is well understood by some other person or the one whom you have newly recruited.. You can Surely take up a call against him.

This usually happens.. When a person comes to know that his serving days are very few with the existing company.. There will be lack of interest towards his work & he demotivates other Colleagues as well.

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Thanks & Regards
Husna Sadiya