Why Diaz's Merseyside derby goal was given

Should Luis Diaz's goal for Liverpool have been ruled out for offside? Joe Hart explains why - by the letter of the law - the goal was legitimate, but frustrating all the same.

Why Diaz's Merseyside derby goal was given
Should Luis Diaz's goal for Liverpool have been ruled out for offside? Joe Hart explains why - by the letter of the law - the goal was legitimate, but frustrating all the same.