Swansea City insist their sale of Michel Vorm to Tottenham is above board.
FC Utrecht claim they have not received 30 per cent of Vorm's transfer fee, which they allege was part of a sell-on agreement between them and the Swans when he moved to Wales for £1.5million in 2011.
"The transfer of Michel Vorm was conducted and concluded correctly under Premier League rules," a Swansea spokesman said.
"It was approved by the Premier League and also FIFA via their TMS (Transfer Matching) system.
"While we have been in contact with Utrecht as a matter of courtesy, we will continue to conduct our business in the best interest of our football club and our supporters, and not based on the views of other clubs.
"Unlike some countries abroad, we do not have third party ownership of players in Britain.
"The club will not be commenting further on this matter."
Utrecht general manager Wilco van Schalk claimed on Friday that Swansea chairman Huw Jenkins had told him Vorm had gone to Tottenham "for free".
Schalk told BBC Wales: "That's unbelievable and unacceptable.
"Michel is a very reliable goalkeeper in the Premier League. He is 30-years-old, in the prime of his life. He still had a two-year contract and has a good reputation.
"Besides that, he's a solid member of the Dutch squad. We want to have the 30 per cent as we agreed."
