This is the first time the white card has been used.
Sporting Lisbon and Benfica were both shown a white card during their fierce derby match after a new rule in Portugal was introduced.
Yellow and red cards are commonly used however the white card during Sporting women's game against Benfica.
With Benfica leading 3-0 at the time, medical staff from both sides ran to the aid of a player who reportedly complained of feeling ill in the first half.
After the issue, the referee was seen brandishing a white card to both sets of medical staff, which was met with cheers from the crowd in Lisbon.
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White cards have been introduced as part of a new initiative for officials to recognise and praise clubs for fair play during games and was introduced to improve ethical values in the sport.
Although not a common practice yet, the white card is part of a series of new introductions in football. Additionally, concussion substitutes and longer stoppage time - as seen in the World Cup - have been brought in to improve the safety and entertainment of the game.
Benfica went on to win the game 5-0 and advance to the semi-finals.
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