The British national team of Group E, the same as the Japanese national football team, Nadeshiko Japan, expressed protest against racial discrimination with one knee on the ground before the start of the qualifying league with the Chile national team.
The Olympic Charter prohibits demonstrations and publicity activities related to politics, religion, and race at competition venues, and at the 1968 Mexico tournament, American athletes who raised their fists on the podium in protest against black discrimination were expelled from the tournament. There is an example.
However, at the Tokyo Games, it was decided that some of this would be eased, and in response to this, the British national football team decided to express a protest against racial discrimination before the match.