Premier Rugby will not comment on any individual cases following salary cap allegations made by Wasps owner Steve Hayes.
Hayes claims one unnamed Guinness Premiership club could be investigated for alleged salary cap abuse.
"I've no hard evidence, just common sense," Hayes told The Guardian.
"You look at what's happening and what one club have been doing. I think they're going to have a challenge."
The current Premiership salary cap stands at £4million per club, per season.
Hayes' comments follow the rugby league scandal in Australia that has seen Melbourne Storm stripped of NRL titles they won in 2007 and 2009 after they exceeded a salary cap by more than £1million over the past five years.
A Premier Rugby spokesman said: "Enquiries are always ongoing as part of the process of policing the salary cap.
"But Premier Rugby will not comment on any individual cases, and neither should other clubs."
Hayes added: "The professional game has to avoid cheating. There is a salary cap and it's there for a reason.
"I don't think it will always stay at its current size, but it's there to develop the game. Rugby has only been professional for 15 years, and it takes time.
"If you've only got one or two teams every year winning the same things, it's just not going to work. The product will become poorer as a result."