Fisher, 41, appeared at the Victorian County Court on Thursday via video link where he formally pleaded guilty to six charges.
They include trafficking a large commercial quantity of methamphetamine, trafficking cocaine and possessing drugs including LSD, ketamine and testosterone.
Fisher, a past All-Australian and two-time St Kilda best and fairest, organised for a parcel containing one kilogram of methylamphetamine and 84 grams of cocaine to be sent from Melbourne to Perth.
The drugs, concealed inside a rangehood, were seized by WA police on April 20, 2022.
Police then arrested Fisher on May 18 and searched his home in Hampton in Melbourne's southeast.
They seized more than 13 grams of methylamphetamine and close to two litres of 1,4-Butanediol, as well as other drugs.
Fisher was remanded in custody following his arrest but he successfully applied for bail in July 2022.
He was released to a residential rehabilitation facility where he has spent the past 18 months receiving treatment for his drug addiction.
Fisher remained mostly silent during Thursday's court appearance, only stating his pleas of guilty after each charge was read to him.
His barrister Dermot Dann told the court he would need some time to gather psychological material, character references and evidence of Fisher's rehabilitation.
The case was adjourned to a pre-sentencing hearing before Judge Gerard Mullaly on April 29.
Fisher's bail was extended to his next court date.
The 41-year-old played 228 games for St Kilda, including consecutive grand finals in 2009 and 2010, before retiring from the AFL in 2016.
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