Letting Lautaro Martinez go to the Arab Pro League certainly isn't a good option, but if that's an option Inter needs to consider then they could sell him too. Lautaro Martinez, of course, still really wants to stay in Europe because he feels he can still compete in the top-flight competition at the moment, this will also support him being called up to the national team because of his performance.
It is impossible for Inter Milan to sell Lautaro Martinez. He is the best striker in Inter Milan, they will keep him as long as possible.