Mark Thompson has backed James Hird's claims there had been documents detailing Essendon's 2012 injecting program – but he would not confirm the paperwork was handed to investigators.

Attention again turned to the Bombers' supplements regime on Tuesday, when the World Anti-Doping Agency announced it would appeal the not-guilty verdict handed down by the AFL anti-doping tribunal.

Support: Mark Thompson and James Hird. Credit:Sebastian Costanzo

Hird dropped a bombshell on Fox Sport's AFL 360 program that evening, saying he had seen written records showing the 34 past and present players had been injected with legal substance thymomodulin, and that those documents had been handed to the Australian Sports Anti-Doping Authority.