VIDEO: See how Napoli beat Borussia Dortmund in Italy

                                                           Borussia Dortmund face their most difficult challenge of the past three years on Tuesday night when they host Napoli in a make-or-break Champions League encounter. For the first time in over three years, Dortmund have lost three games in a row and they go into this home clash with the Serie A side knowing their entire season could depend on its outcome. Without a win, Dortmund could well be out of the Champions League, or at best, no longer in control of their own destiny, and coming into such a game after a 3-0 defeat to bitter rivals Bayern Munich makes it particularly challenging. Klopp under serious pressure.........