REVELATIONS that Essendon is under ASADA investigation has sparked AFL clubs to run a fine-tooth comb over their processes on the use of supplements and medication by players.

Clubs contacted by AFL.com.au said conversations had taken place between football managers, medical and sports science staff to ensure that protocols in place were watertight.

At Melbourne's AGM on Wednesday night, club president Don McLardy echoed the sentiments at most clubs when he told members: "We are revisiting our own internal procedures and protocols in this area and at this point don't believe we need to take any additional action."

Clubs also said that players would take note of what was happening and be reminded of what was at stake.

Brisbane Lions general manager for football operations, Dean Warren, said the club would take the opportunity to stress what was expected.

"It just gives us another great opportunity to continually reinforce with our players that under no circumstances are you take anything without having it first checked or cleared by your doctor," he said.

Although all clubs pointed to the role doctors played in authorising supplements or medications, the AFL Medical Officers' Association chief, Dr Hugh Seward, said it was appropriate for clubs to continually assess their protocols.

Seward said that as the AFL became tougher and more competitive clubs must place greater emphasis on their governance processes to ensure inappropriate things don't occur.

While he stressed that he did not know what might have taken place at Essendon in 2012, Seward said all clubs would want to be assured from board level down that it was following appropriate processes in the management of their players.

Seward said the Association's advice to clubs was that doctors must approve the use of any supplement or medication and if anyone suggested anything should happen without doctor's approval, alarm bells should ring.

"We recommend that everything goes through the doctor," he said.

"That is what he is trained for and he has more pharmaceutical knowledge than other members of the normal football department."

He said good governance protected both player and professionals within the club in an era when players were potentially vulnerable to outsiders.

"If the player chooses to take something that isn't part of the process then it falls on his head," Seward said. "But most won't [go outside proper process]."