Referee Tobias Welz shows a yellow card to Chris Fuehrich of VfB Stuttgart and Christoph Zimmermann of Darmstadt 98 during their Bundesliga match on 17 February. Photo: Matthias Hangst / Getty Images
SPORT
The red and yellow cards were introduced to football after the 1966 World Cup, when a famous and excellent English referee called Ken Aston had a brain wave while going home from a match.
There was huge controversy during a 1966 World Cup quarter-final match between Argentina and England.
READ: Hanging Judge | Nothing untoward with two yellow cards and a red one
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