Scottish Premiership referees will once again be under the microscope as Celtic and Rangers clash in the east end of Glasgow this Saturday (kick off: 12pm).
With fans of both teams desperate for three points in order to aid their title challenge, every decision will be magnified as the battle to be crowned champions of Scotland hits fever pitch.
Willie Collum has been handed the task of officiating this weekend’s mammoth clash at Celtic Park and will take charge of the 11th Old Firm fixture of his career. But how does he compare to other Scottish Premiership officials this season in terms of handing out yellow and red cards?
Who is card happy and who has not yet issued a red card all season? Using soccerbase.com, we rank every Scottish Premiership referee that has taken charge of 10 games or more by awarding one point for each yellow card given out and three points for each red.
5. Kevin Clancy - 62 points
Next up is Clancy. This official has handed out just one red card this year and 59 yellows, which hands him an average of 3.93 yellows and 0.06 reds per game. He is more likely to book a player than Collum, Beaton or Robertson but less than likely than Walsh or Dickinson. | SNS Group Photo: SNS Group
6. Don Robertson - 59 points
Taking charge of 16 games in the Scottish Premiership this season, Robertson is more likely to send a player off than most, showing a total of four red cards - a league high - alongside 47 yellows. This gives him an average of 2.94 bookings per game and 0.25 red cards per game | SNS Group Photo: SNS Group
7. Chris Graham - 58 points
One of only two referees to not issue a red card this year, Graham has handed out 58 yellows from his 10 games in charge this year which makes his average of 5.8 bookings per game is a league high. | SNS Group Photo: SNS Group
8. Willie Collum - 58 points
Collum will take charge of Saturday's Old Firm. He has awarded 55 yellows but just one red this season. An average of 3.23 bookings per game but just 0.06 reds. Collum has also officiated the second highest amount of games in the Scottish Premiership this season, taking charge of 17 games in total. | SNS Group Photo: Alan Harvey - SNS Group