Borussia Dortmund chief executive Hans-Joachim Watzke has defended new loan signing Jadon Sancho against accusations of a lack of discipline. The England winger, 23, has returned to former club Dortmund until June after being ostracized at Manchester United, partly for his timekeeping. “Jadon doesn’t have a discipline problem, I don’t know who always says that,” Watzke told Sky ahead of the Bundesliga match at Darmstadt on Saturday. “Jadon only has one problem, he’s late from time to time. He only has one watch, just like everybody. He’s a very nice lad, every now and then he’s tardy. But you …