Officers from Leicestershire Police's Belgrave and Rushey Mead areas posted their warning on the Belgrave Community Facebook page.
"Belgrave and Rushey Mead police are alerting residents to be aware of bogus faith or spiritual healers," police said.
"Please remind family and friends, especially those who may be suffering from stress or worry, not to be drawn into handing over large amounts of money for these 'services'," it said.
Police believe that such bogus healers usually target vulnerable people, 'Leicester Mercury' newspaper reported.
"They will claim that money given to them will be returned to their victims many times over and threaten those who do not pay with curses and black magic. If anyone is aware of anyone claiming to be a faith healer we would like to hear from you," the spokesperson said.