Greens call for ASADA inquiry

The Greens are pushing for a parliamentary inquiry into the nation's anti-doping agency in the wake of its failed case against 34 past and present Essendon players.

"No one could argue the system is working properly," Greens senator Richard Di Natale told ABC Radio on Thursday.

The senator said he didn't want to claim ASADA had botched the Essendon investigation, preferring to question whether the anti-doping code was appropriate for team sports such as AFL and NRL.