Can you vacate tenants when you purchase a rented property?

I am about to purchase a property. It was rented to an Emirati couple until 28-12-2021 (as mentioned on the agreement).

We are all set for transfer and I was looking forward to staying there. Now I was told by the agent that the seller hadn't given notice period to the tenant and had to extend their tenancy contract.

Would like to know what are my rights?

Looking for your guidance.

Thanking you.

Kind regards.