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Here is the guidance document
Jewellery, religious or not, is strictly speaking not allowed on the football pitch. Referees though are encouraged to be flexible and pragmatic where possible and allow religious jewellery such as the Sikh kara (steel bangle) or Hindu rakhi (small cotton bracelet) if, and only if the referee deems it safe. Safety will always take priority in these situations. One pragmatic solution could be to wear a small kara or rakhi underneath a wrist sweatband.
OK, I stand corrected (to a large extent). The article on the link below describes a necklace which some Muslims wear. However it's still not a requirement like the Sikh and Hindu jewellery and the article makes it sound more like a personal choice than anything else.I have to say I'm not familiar with any religion that requires wearing a necklace.
Helps when you upload the right document lolThat document only deals with headgear though. It doesn't cover the scenario of someone wanting to tape a religious necklace* to their chest.
The document on the link below (also from the Essex FA, interestingly enough) provides a much more comprehensive treatment of the issues surrounding religious jewellery and religion in the game in general.
Belief in the game
It also doesn't specifically cover the matter of taping a religious necklace.* However it does have the following advice.
*I have to say I'm not familiar with any religion that requires wearing a necklace. Bracelets (as mentioned above) yes, but necklaces? Difficult to say definitively that that's not a thing but I think that if as you say, your going to be encountering this player repeatedly, I'd be inclined to ask them (in a very polite and roundabout way, of course) which religion it is that requires this. I'd be interested in the answer.
But in the end, as the document linked to above says, it's still up to you as the referee to decide, based on safety considerations, whether you're going to allow it, even if you accept it as being a religious requirement.