Swansea City are due in the Court of Arbitration for Sport on Friday over Dutch goalkeeper Michel Vorm’s disputed sale to Tottenham Hotspur.
Utrecht are taking action as the Dutch club claim they are owed a sell-on fee from his £1.5m sale to Swansea in 2011.
The Swans maintain Vorm’s move to Spurs in 2014 was a free transfer.
Swansea have previously insisted no wrongdoing. Utrecht have already had their case dismissed by world football’s governing body Fifa.
When Vorm joined Tottenham, Wales defender Ben Davies also joined Spurs in a £10m swap involving midfielder Gylfi Sigurdsson – a deal Swansea say was separate to Vorm’s transfer.
Swans chairman Huw Jenkins will be in court in Switzerland while Eredivisie club Utrecht are represented by director Wilco van Schaik.
The outcome of hearing in Lausanne is not expected until next month.