You have to meet residency requirements. Which, if I have not mistaken, is 5 years (used to be very low but after UAE won ICC trophy using only outsiders, we lobbied to make them tougher).
Besides residency issue, they have to compete against everyone else for the spot. Beside that, why not?
সন্মানজনক পরাজয়ের চিন্তাটাই অসন্মানজনক