"We're not racists but we see the absence of black players at Zenit as an important tradition," Zenit fan club Landscrona said in a letter, called the "Selection 12 manifesto", posted on its website on Monday.
"It would allow Zenit to maintain the national identity of the club, which is the symbol of St Petersburg."
"We only want players from other brotherly Slav nations, such as Ukraine and Belarus as well as from the Baltic states and Scandinavia. We have the same mentality and historical and cultural background as these nations," the letter said.
They also expressed their opposition to having "sexual minorities" in the team and demanded that each player would give "101 percent effort" in every match.
A Zenit spokesman said on Monday the club would not comment on the fans' letter.
Former Zenit and Russia striker Alexander Panov said the fans have no right to influence the club's selection policy.
"If we don't have enough good players from St Petersburg, then what should the club do?" the St Petersburg native was quoted as saying by local media.
"All clubs around the world have black players. If they are absent from Zenit - it's Zenit's problem. I don't think fans should demand the club buy or don't buy certain players. The fans have the right to go to the stadium or stay home."
