FIFA and CSA launched investigations, with the latter saying it was “highly likely” the 38-year-old player knew about the incident.
In a statement Wednesday, Priestman said she took responsibility for her colleague’s actions after a scouting report submitted by Lombardi was sent to Mander.
A French court said on Thursday that Lombardi had been sentenced to eight months’ probation after pleading guilty to flying a drone in an urban area without a license.
The next day, Canadian Olympic Committee chief executive David Shoemaker said “there appears to be information that could taint” Canada’s women’s soccer team’s victory at the Tokyo Games.
Canadian media reported that drones had been used in previous games.
Assistant coach Andy Spencer will be in charge of the remainder of the Games, with the reigning Olympic champions facing France on Sunday.
Canada earned three points from beating New Zealand in their opening match, but FIFA sanctions have left them with three points in Group A, ahead of games against the host nation and Colombia.
CSA can appeal the decision to the Court of Arbitration for Sport.