Why was Luis Diaz's goal ruled offside against Tottenham?

Why Liverpool forward Luis Diaz had his goal against Tottenham Hotspur ruled out for offside in the Premier League.

Who would want to be a video assistant referee, eh? Well, Darren England certainly won't want to be on duty for a fair while after his high-profile error came under justifiable scrutiny following Liverpool's trip to Tottenham Hotspur on Saturday.
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Source : 90min