Crowley was initially scheduled to front up to the AFL Anti-Doping Tribunal this Friday.
But the date has been moved back after ASADA requested more time to respond to submissions made on behalf of Crowley.
Crowley is facing a ban of up to two years after failing a doping test last year.
It's believed the banned substance was contained in a painkiller that Crowley sourced from outside of the club.
The delay in the hearing means Crowley's earliest possible return will be the round-eight clash with North Melbourne on May 23.
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