Chong is on-loan at Werder from United on-loan for the season.
He praised the influence of Mata on his early career development and revealed he is still in touch with the Spaniard on a regular basis.
“Juan Mata was amazing on and off the pitch," he added.
“I can highlight many positively. Everyone helped me a lot. I am still in contact with them, and they often ask me how I am.
“(I respond that) everything is fine for me and that I want to develop myself further in Bremen."
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