Dear sir my passport is going to expire on 5th...

If your inquiry is related to changing the company, here is the following information:
In order for you to change the company, the work contract must be legally terminated until the sponsorship transfer to a new company is approved.
If the work contract has expired, you can transfer the sponsorship without the consent of the current sponsor.
But if the work contract is still valid in that case, the approval of the current employer must be obtained.
Also, the validity period of the passport must be at least one year in order to be able to grant you a visa