Possibility of entering the GCC with an unpaid loan in the UAE

Good day, Sir,

I have one question. My brother in law ran away from his debt with Dubai Islamic Bank amounting to around AED 165,000.00.

Now, he is planning to apply for a job in Saudi Arabia. Is there any possible way for us to check if he is banned within the GCC countries?

Will he be arrested once he enters the GCC countries?

Thanks