Manchester City may've let the US's next big thing slip their net.
BVB No2 Jorg Heinrich said, "Gio is a fantastic talent. We must be careful about his development. We do not want him to play regularly before he is ready. He has enormous potential and great self-confidence.
"His talent is reminiscent of Christian Pulisic's, he may even be better.
"But we want to take it easy with him because we know what can happen to many young players."
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