Essendon chief executive officer Ian Robson has quit as the fallout from the AFL club’s supplement scandal continues.

Robson has been under pressure since February when the Australian Sports Anti-Doping Authority (ASADA) announced an inquiry into the Bombers’ use of supplements in 2012.

An internal investigation by former Telstra boss Ziggy Switkowski into Essendon’s governance standards was critical of the club’s structures and accountability surrounding the supplements program.