The Williams Formula 1 team says it has not received any notice of legal action against it or new chief engineer Mike Coughlan by NASCAR team Michael Waltrip Racing.
Coughlan had previously been employed by Waltrip as director of vehicle design, and court documents showed that Waltrip was alleging Coughlan had breached his contract by leaving to return to F1 with Williams.
A Williams spokesperson said: "Williams F1 is aware of reports that a lawsuit has been filed by Michael Waltrip Racing against the team and Mike Coughlan. Neither Mike nor the team have received notice of any proceedings, or indeed have had any contact with Michael Waltrip Racing since early June. Consequently, we have no further comment to make on this matter."