I think it'll be very difficult for Romelu Lukaku to join another Italian club this season and that's because of how much he loves Inter Milan and his continuous desire to play the Milan club.
Since his services are no longer needed at Chelsea I think it'll be a good decision for Lukaku to go to Saudi Arabia. Age is no longer in the side of the powerful striker who knows how to bully defenders with his strength and tactics. Saudi Arabia clubs will offer him the best financial package he can get from anywhere at the moment
If Romelu Lukaku still loves Inter Milan so much, of course he will find a way to leave Chelsea and not instead accept an offer from the Saudi Arabian club at this time. But if Romelu Lukaku prefers to think about money, it is clear he will accept a very lucrative offer from the Saudi Arabian club rather than stay at Inter Milan or Chelsea. Especially now that he is no longer young, so he must be able to make wise decisions for himself before next season starts.