Martin Atkinson has been tasked with controlling one of the fiercest rivalries in the Premier League.
Atkinson doesn't just have 22 players to worry about, he also has two volatile managers with 'history'.
I used to love refereeing these huge matches and had a clear gameplan for the first 20 minutes, just as Atkinson will. Allow the game to settle down and do not over-react to the demands of the crowd if a big challenge went in.
It is important to empathise with the players who will be edgy and will urge you to act strongly against opponents.