Essendon great Tim Watson says he expects 34 current and former Essendon players to be found not guilty of being administered thymosin beta-4 on Tuesday when the AFL's anti-doping tribunal hands down its verdict.

Watson, who is the father of current skipper Jobe, told radio station SEN that he was experiencing a lot of emotions but that he was "relaxed".

"I believe that there will be a not guilty [verdict]," he said

"I believe that because I am privy to a lot of what has taken place to this point in terms of the evidence.

"On that alone I'm confident that the players wont be found guilty."

For the players are to be found guilty, AFL anti-doping tribunal chairman David Jones and his panel must determine to a "comfortable satisfaction" that a banned drug was given. No penalties will be handed down on Tuesday.

Watson said he had spoken to Stephen Dank, the man at the centre of the supplements scandal, and been told that the players had not been administered any banned substances.

"I've had conversations with Stephen Dank. I've had three conversations with him," Watson said.

"He rang me to tell me that ... the players were not administered any banned substances, which included Jobe."

When asked if he was comfortable with that, Watson replied: "I'm comfortable ... I'll be more comfortable when the players are cleared today, yes."

Watson said "there's always going to be anger" surrounding the fact that his son was injected with substances that the club can't explain. He said there will be "disappointment" until it can be explained.

He said he had gotten no clarity from the AFL on the issue, either.

"I've asked people in the highest office at the AFL: 'OK, well if you know of something else that was administered to the players which everybody keeps saying - to be able to make that determination, you must be able to tell me what it is and tell people what it is', but that hasn't been forthcoming either."

Watson confirmed that the players will be gathering as a group when the verdict is handed down. He said it was likely that verdict will "leak out there very quickly", despite the fact that the verdict will be given in-camera in a room at Etihad Stadium.

"I think there's a chance that there won't be a public statement about the guilty or not guilty verdict until about 4 o'clock when everyone's ... had a chance to digest what the summation was from the tribunal members," he said.