Although Ball was not considered a prospect at the time for the National Basketball Association (NBA), he planned on preparing for the 2018 draft with his father after leaving UCLA. On December 11, 2017, he signed with Prienai of the Lithuanian Basketball League (LKL), along with his younger brother LaMelo, who left Chino Hills before his junior season. The brothers' move to Lithuania was heavily reported by American sports media. Prienai withdrew from the Baltic Basketball League upon their arrival and took part in various exhibition games sponsored by his family's sports apparel company, Big Baller Brand.