Director of sport Dietmar Beiersdorfer insisted the Russian club was concerned only with the quality of players and not their ethnic origin, nationality or sexual orientation. Zenit was the only Premier League team without a black player in their squad until earlier this year, when they brought in Hulk and Axel Witsel from Porto and Benfica respectively.
Zenit remain the only club in the top flight to have never signed an African player, but Beiersdorfer told the club's official view: "We make our player selections without any limitation regarding origin, religion or skin colour. We have absolutely no policy in Zenit of limiting our player selection in any superficial way. The one and only restriction our club sets is the matter of quality."
He added: "Our club's goal is to win the Russian championship and to be highly competitive in international competitions as well.
"To reach these goals we need a team formed with players which we develop in our academy, as well as the best current and available players from Russia and abroad."
Beiersdorfer's comments came after Zenit coach Luciano Spalletti spoke of the need for tolerance, seemingly in response to the publication of an open letter titled 'Selection Manifesto 12'.
The letter was published on influential Zenit fan website Landscrona and detailed its authors' "principles for selection'' and preferred criteria for future signings.
Spalletti said: "Tolerance for me is the ability to understand and accept differences. Furthermore, being tolerant means that you fight against any kind of stupidity.
"I can personally assure you that I will do everything I can to help those who seek to explain what tolerance is, and the need to respect other cultures and traditions.
"The team has gathered players from different countries and ethnic groups who work together to achieve a common goal. Their combined efforts bring tangible results."