Birmingham Brummies speedway bosses are awaiting further details on the discovery of illegal silencers in the possession of Krzysztof Kasprzak.
The Polish star was found with the banned equipment prior to a Swedish League meeting earlier this week.
He went on to ride in the meeting for his club Vargarna with legal machinery, taking seven points from five rides.
"We need the full facts as there is plenty of hearsay at this stage," said Brummies boss Graham Drury.
"Clearly this is a major subject in the sport at present and once we have all the information we will make further comment.
"We are awaiting official reports from the meeting in Sweden, and as soon as we receive that we will decide on what action to take."
Illegal silencers are a hot topic in speedway after the Coventry Bees skipper Edward Kennett was suspended for using banned equipment at Lakeside last weekend.
Kennett has been stripped of the Bees captaincy, and awaits a full hearing into his offence by the British Speedway Promoters' Association.
Drury has also moved to end rumours about the reason Britain international Ben Barker missed Monday night's meeting at Belle Vue.
"I know supporters have been asking why Ben wasn't riding, and the reason was that on Saturday at Plymouth he got his foot caught under the footrest and could hardly work," insists the Birmingham boss.
"It's a pity he was unfit because I feel sure we would have won the meeting with him riding."
The Brummies hope to have Barker available for Thursday night's Elite League fixture at home to Peterborough, a match that Kasprzak is still scheduled to ride in.