The 20-year-old striker has been sent to Werder Bremen on loan for the 2020/21 season.
"I love to go and dribble in one-on-one situations," Chong told Bremen's official website of his qualities.
"[But] I didn't perform in the games in Manchester as I would have liked.
"The focus is now entirely on Werder Bremen and on playing a good season with the team."
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