Mosley has admitted that he finds it highly improbable that Dennis did not know what was going on with the infamous Ferrari technical specifications leaked to his team by a disgruntled employee.
"One can only say it's extremely improbable that Ron didn't know," Mosley told The Guardian.
"Every time I speak to him he still assures me that he would never tell a lie, that he never has told a lie and that he hasn't lied to us.
"When you've known somebody for 40 years it's very difficult just to say, 'Well, I don't believe you.' But in the end no hard-nosed lawyer or policeman would believe it for a moment. I'm probably being a bit of a wimp about it."