Sarah McIver, an English teacher from Alberta, was arrested by the Chinese authorities over alleged work-permit violations.
Drugs offences are routinely punished severely in China.
She has returned to Canada after being released from custody in China.
China and Canada insisted McIver's case was different from Kovrig's and Spavor's.
On Saturday, a Chinese court is hearing an appeal in the case of a Canadian citizen held on drugs charges, that could further test the tense relations between the two countries.
Mr. Kovrig is a Canadian diplomat on leave from the federal government.
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China's Foreign Ministry said this month that Ms McIver was undergoing "administrative punishment" for working illegally.
The detentions came amid a dispute between Canada and China following the arrest of Huawei chief financial officer Meng Wanzhou earlier this month.
Citing a statement released on the official website of Liaoning Higher People's Court on Wednesday, China's Global Times newspaper reported that "the court will accept and hear the case of appellant Schellenberg at 2:00pm local time Saturday".
The last foreigner to be tried for drug smuggling was British national Akmal Shaikh, who was caught in 2007 while smuggling over 4 kilograms of heroin into China.
A Chinese government news portal, runsky.com, identified Schellenberg as Canadian and said he was accused of smuggling an "enormous amount" of drugs. They have each only been allowed to see Canadian diplomats once since being detained.
China has demanded Canada free Meng, who is fighting extradition to the United States, where she would face fraud charges that carry a maximum sentence of 30 years jail for each charge.
Meng was released on bail in Vancouver, where she is under private guard at one of the two homes she owns there.