The Thriller hitmaker is believed to have had the Narcan implant put in place in 2003 to counteract drug effects as he fought his alleged addictions.

The medical device has come to light after it was referred to by one of the singer's former doctors, anaesthetist David Fournier, in newly released court papers related Katherine Jackson's civil suit against concert promoters AEG Live.

The documents state, "Fournier believed Jackson had deceived him by not telling him about a 'Narcan implant' Jackson had inserted before a surgical procedure Fournier was helping with."

The medic, who treated the star in the 1990s and early 2000s, alleged Jackson "intentionally failed to reveal the implant" to him.

According to Britain's The Sun, his testimony will be used as evidence in Katherine's wrongful death lawsuit.

The family matriarch claims bosses at AEG Live, who organised Jackson's doomed This Is It comeback concerts, were negligent in ignoring life-threatening health concerns. She holds them responsible for hiring Conrad Murray, the medic who was convicted of involuntary manslaughter for causing her son's death in 2009.