The campaign is named after the only other professional footballer, aside from Anton Hysen, who went public about their sexuality.

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Rogers' retirement means there are still no openly gay players participating in professional football in Europe with the exception of Swedish-based Anton Hysen.

CNN: U.S. soccer star 'comes out' as gay

Former United States national team player Robbie Rogers recently announced he was gay on the same day he retired from the sport, while Sweden-based Anton Hysen is currently the only openly "out" player in Europe.

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At present, Sweden-based Anton Hysen is the only openly gay footballer although other sportsmen have come out in different disciplines, such as Puerto Rican boxer Orlando Cruz, Welsh rugby player Gareth Thomas and English cricketer Steven Davies.

CNN: Robbie Rogers' retirement reasons could bring change