Video Assistant Referee causes controversy every week in the Premier League , but how are decisions made, and are they correct?

After each weekend we take a look at the major incidents, to examine and explain the process both in terms of VAR protocol and the Laws of the Game.

In this week's VAR Review: Should Arsenal 's penalty against West Ham have been cancelled? What happened with Sunderland 's overturned spot kick at Manchester United ? And why didn't Alexander Isak win a penalty for Liverpool at Chelsea ?

Arsenal 2-0 West Ham

Possible penalty overturn: Position of foul by Diouf on Timber

What happened: Arsenal were awarded a penalty in the 67th minute when Jurriën Timber raced onto a pass and was brought down on the edge of the area by El Hadji Malick Diouf

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