The talented English winger is on United's radar ahead of the summer transfer window, but Mattahus - perhaps unsurprisingly - thinks Bayern Munich would be a better fit for the 20-year-old.
He said, “He'll probably go back to England. But what does he want at Chelsea or United?
"They may not even be playing in the Champions League next year.
“I could very well imagine Sancho at Bayern, also because he can play on both wings."