Internal interface with dual IP addresses

I want to retire old Cisco router; however, a lot of devices with static IP address are using that router as default gateway. Can I add that IP address from Cisco router to Sophos UTM internal interface and keep current IP address on the Sophos box as well? Is it possible to have dual IP addresses on the same interface? If yes, please help me with the configuration.

Thanks,
m@rek

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