The talented 20-year-old will spend the full 2020/21 campaign in Germany, and could make his competitive debut in a month's time with the Bundesliga due to begin on 18 September.
Chong, who was born in Curacao and has been capped six times by Netherlands' Under-21s, was given his senior United debut by Ole Gunnar Solskjaer in January 2019, when he came off the bench in the Emirates FA Cup win over Reading.
Moments like that helped the Under-23s regular to land the club’s coveted Denzil Haroun Reserve Team Player of the Year award in May 2019, 12 months after he claimed the Jimmy Murphy Young Player accolade.