THE WORLD Anti-Doping Agency will appeal the AFL Anti-Doping Tribunal's decision to clear ex-Essendon sports scientist Stephen Dank of 21 breaches of the League's drug code.

WADA, who has already lodged an appeal to the Court of Arbitration for Sport against the AFL Tribunal's verdict in favour of the 34 past and present Essendon players, announced on Tuesday it would also take Dank's matter to the CAS.

"After a thorough examination of the evidence contained within the case file, WADA has decided to lodge its independent right of appeal to the Court of Arbitration for Sport," said WADA director general, David Howman, in a statement.

"As with all pending legal cases, WADA will refrain from commenting further on this matter, or indeed its recent appeal on the 34 current and former Essendon AFL players, until any decisions have been made by CAS."

WADA appeals against Essendon doping decision

ASADA chief executive Ben McDevitt said the Australian anti-doping body welcomed WADA's decision.

"ASADA will fully support the WADA initiated appeal to the Court of Arbitration for Sport," McDevitt said.

The AFL Anti-Doping Tribunal announced in April it had found Dank guilty of 10 breaches of the code, but he was cleared on three charges relating to administering the banned substance Thymosin-Beta 4, the supplement at the centre of the case against the players.

Dank's case was examined alongside the players' during the Tribunal hearing that stretched over several months, and Dank was found guilty of breaches which include "trafficking, attempting to traffic and complicity in matters related to a range of prohibited substances".

Those substances are Hexarelin, Humanofort, CJC-1295, GHRP6 and SARSM.

Dank will face the AFL Appeals Tribunal from June 9-12.

There have been reports WADA will push for the CAS hearing involving the players to be held in Switzerland, but it remains months away from beginning.

Can WADA do what ASADA couldn't?

Essendon coach James Hird said last month that he didn't care where it was staged, remaining confident the players will again be cleared of any wrongdoing.

"It's beyond me. It will be where it will be, I think it's a long way away before that decision's made. But Switzerland, Melbourne [or] Sydney, I think the result will be the same," Hird said.