Manchester United manager Erik ten Hag is taking care with the tutelage of young defensive star Willy Kambwala. Willy Kambwala was handed a shock debut late last year for Manchester United amid a defensive injury crisis, but manager Erik ten Hag would not have thrown him in if he did not feel he was capable of stepping up. The academy star has regularly been a part of matchday squads since, and has made four appearances in total now, three as a substitute. A new injury to Lisandro Martinez has underlined Manchester United’s need for defensive depth, with Kambwala in the mix. Kambwala gets an a…