The Australian Sports Anti-Doping Authority has completed its investigation of the AFL and NRL, the body's chief told a Senate hearing on Wednesday.

Outgoing ASADA chief executive Aurora Andruska said the authority was now reviewing the evidence it had gathered and developing briefs.

Investigation complete: Outgoing ASADA chief executive Aurora Andruska. Credit:Alex Ellinghausen

Andruska said former Federal Court judge Garry Downes would review the evidence to determine whether it was sufficient to take cases forward.

But she said Downes' work would not hold up the authority's work, and it would continue to prepare briefs and could issue show cause letters to players and take matters through the Anti-Doping Rule Violation panel and other tribunals while Downes completed his review.