Liverpool players took a knee around the center circle during a training session at Anfield on Monday, with many then posting the picture on social media with the caption "Unity is strength. #BlackLivesMatter".
Manchester United players Paul Pogba and Marcus Rashford also added their voices to worldwide protests against racism.
France midfielder Pogba said in a passionate Instagram post that he felt "felt anger, pity, hatred, indignation, pain and sadness".
England forward Rashford said he had been "trying to process what is going on in the world".
In Germany's Bundesliga, Jadon Sancho and Achraf Hakimi of Borussia Dortmund, Weston McKennie of Schalke, and Marcus Thuram of Borussia Monchengladbach made on-field protests at the weekend.
Tennis stars Serena Williams, Coco Gauff and Naomi Osaka have also spoken out, while basketball legend Michael Jordan said he was "deeply saddened, truly pained and plain angry".
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