Adidas UK has issued an official statement regarding the situation saying

“As part of our partnership launch with Arsenal we have been made aware of the abuse of a Twitter personalization mechanic created to allow excited fans to get their name on the back of the new jersey. Due to a small minority creating offensive versions of this we have immediately turned off the functionality and the Twitter team will be investigating.”

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Arsenal has also issued a statement of its own.

“We totally condemn the use of language of this nature, which has no place in our game or society. We work hard as a club to encourage diversity and inclusion through our Arsenal for Everyone program, launched in 2008 as a celebration of the diversity of the Arsenal family. Through a number of initiatives undertaken in the community, inside Emirates Stadium and throughout the club, Arsenal strives to ensure that everyone associated with the club feels an equal sense of belonging.”