Plymouth Devils' chairman Mike Bowden has threatened to bulldoze St Boniface Arena over rumours his speedway licence has been revoked.
Supporters' online forums allege that Bowden's licence was revoked either during or after a meeting of the British Speedway Promoters' Association last Tuesday.
Association members were meeting to discuss their plans for their annual meeting, scheduled for next month.
Chairman Alex Harkness has made it clear that the pre-annual meeting did not have the authority to revoke anyone's licence.
A four-man consortium is in the middle of negotiations to buy the Premier League outfit, who are based at St Boniface Arena, Marsh Mills.
Bowden said: "Allegations that my licence has been revoked are totally untrue, whatever people on these forums think.
"There have been allegations made against me and my family which are spiteful and, I believe, libellous. These comments are damaging my business by suggesting my licence has been revoked.
"I have to say that if these sort of people continue to offend me and make remarks which are untrue, I will bulldoze the circuit and see how they like that. I am serious – I am sick of all these comments being made."
Swindon Robins reached the Elite League play-off final with a 38-point aggregate victory over Birmingham Brummies.
The Robins won the second leg 55-37 at Abbey Stadium after gaining a 20-point lead from the first leg at Perry Bar.
The Robins made a lightning start in the home leg last Thursday to move 12 clear after four races. Further 5-1 wins in heats nine and ten secured their progression, before they sealed an emphatic 110-72 aggregate victory.
Reserve Simon Stead put his recent form behind him to star with a confidence-boosting 12-point maximum.
Perry Bar: Brummies: Smolinski 9+3, Barker 9, Ulamek 7, Pedersen 5, King 3, Auty 2+1, Covatti 0.
Robins: Kildemand 14+1, Batchelor 13+1, Doyle 9+1, Andersen 8+1, North 5+1, Morris 5, Stead 1+1.
Blunsdon: Robins: Stead 12, Batchelor 10+2, Kildemand 9, Morris 8+3, Andersen 7+1, Doyle 5+1, Lampart 4.
Brummies: Ulamek 15, King 6, Barker 6, Smolinski 4+2, Auty 4, Covatti 2, rider replacement (Pedersen).
Somerset Rebels saw their home Premier League play-off meeting against Leicester Lions postponed on Friday evening. It has been rescheduled for this Friday. The away leg will be ridden the following evening.