The Dean of Durham has written an open letter to new Sunderland manager Paolo Di Canio calling on the Italian to publicly renounce fascism or risk being associated with "toxic far-right tendencies".
The Very Reverend Michael Sadgrove, the son of a Jewish war refugee and a Sunderland supporter, said he was struggling to stay loyal to the club and that he found Di Canio's "self-confessed fascism deeply troubling".
Di Canio refused to confirm or deny whether he was a fascist at a news conference on Tuesday but has previously stated he is "a fascist but not a racist".
He has also been pictured giving a fascist salute to Lazio 'ultras' and photographed attending the funeral of a leading Italian fascist.
In his open letter to Di Canio, the Dean of Durham wrote: "Your appointment raises very difficult questions. You see, I am the child of a Jewish war refugee who got out of Germany and came to Britain just in time. Some of her family and friends perished in the Nazi death camps. So I find your self-confessed fascism deeply troubling.
"Fascism was nearly the undoing of the world. It cost millions of innocent lives. Mussolini, who you say has been deeply misunderstood, openly colluded with it. You are said to wear a tattoo DUX which speaks for itself. This all adds up to what I find baffling.
"You say that you are not a racist, but it needs great sophistication to understand how fascism and racism are ultimately different. I can promise you that this distinction will be lost on the people of the North East where the British National Party is finding fertile ground in which to sow the seeds of its pernicious and poisonous doctrine.
"You did not necessarily know this before you came. But I believe that unless you clearly renounce fascism in all its manifestations, you will be associated with these toxic far-right tendencies we have seen too much of in this region."
Sadgrove said he was "genuinely perplexed" as to why Di Canio had refused to clarify his political beliefs and warned that the club now stands to lose support and respect at home and abroad.
He added: "Please tell me that I have misunderstood, or missed some fundamental issue here. I am simply telling you with a heavy heart that it feels hard at the moment to stay loyal."