Back in February, infielder Yulieski Gurriel and his younger brother Lourdes Jr. defected from Cuba while in the Dominican Republic for the Caribbean Series. Along with Japanese righty Shohei Otani, the Gurriels are widely considered two of the best players in the world not under contract with an MLB team.
The Gurriels are still going through the process of being declared free agents by MLB, and that can take an awfully long time. They have to first establish residency outside Cuba, then get cleared by the Office of Foreign Assets Control, and then be given the thumbs up by MLB.