Fremantle tagger Ryan Crowley's hearing into doping allegations has been pushed back to May 18.

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 is 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.

AAP