England winger Jadon Sancho is "very happy" at Borussia Dortmund, says the German club's chief executive Hans-Joachim Watzke.
The 19-year-old has scored 14 goals and assisted another 14 this season, and has been linked to a number of Premier League clubs.
"I think he has the feeling that the club does have a good future," Watzke told BBC Sport.
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