Tradeable to untradeable

I recently packed Saliba the other day through the promo packs using my fc points and now I have put a cosmetic evolution on him hes now untradeable I don’t know if the reason why is because of the cosmetic evolution but it’s annoyed me now as I was waiting to sell him until for release and when doing the cosmetic evolution it says nothing about making players untradeable now I’ll say it again I don’t know if the reason why he’s now untradeable is because of the cosmetic evolution and the evolution that I put on him is the one with the gold lines around the card now if this is the reason why then it’s pretty stupid cause I’ve just lost out on massive profit