Detectives said officers are working with Manchester City Football club to identify who threw a coin at Rio Ferdinand.
Charges of those arrested included a racially aggravated public order, pitch encroachment, public order, breach of a football banning order and being drunk and disorderly.
Chief Inspector Steve Howard said: "Despite fierce rivalry and high tension there was no major disorder. However, we will continue to investigate the coin throwing incident and are determined to work with the club to bring the perpetrator to justice."
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Five people have been killed and 40 injured after a car and knife attack in London on Wednesday.
A wet, wintry night in places with rain and hill snow slow to move away from southern Scotland and northern England.
The Westminster terror attack dominates the front pages of Thursday's newspapers.