Juventus must build on their strong defensive performance against AC Milan over the weekend when they face Aston Villa in the Champions League, Juve boss Thiago Motta said on Tuesday ahead of the group game against his former coach Unai Emery. Juve are still unbeaten in Serie A where they drew 0-0 with Milan on Saturday and have the best defensive record in the division, but they have leaked goals in the Champions League where the Italian side are 12th. On the other hand, Aston Villa started