Northampton Saints have been fined £60,000 for releasing George North for Wales duty outside the International Rugby Board's designated window.
Saints granted North permission to play for Wales against Australia on November 30, but Aviva Premiership clubs had previously agreed to only release England players outside of the international window.
Northampton said an agreement was made with North when he moved to Franklin's Gardens last summer, but have decided to not appeal the decision.
A Premiership Rugby statement read: "A meeting took place on Wednesday morning of the Designated Panel appointed by the Premiership Rugby Board under its Code of Conduct to consider the charge against Northampton Saints that the club had breached the Board policy with regard to international player release.
"Northampton Saints admitted the breach with respect to the Board policy through the release of George North beyond the requirements set out in IRB Regulation 9.
"The Designated Panel, comprising three Board members appointed under the terms of the Code, decided that Northampton Saints will be fined £60,000.
"Northampton Saints have decided not to appeal against the sanction.
"There will be no further comment from Premiership Rugby or Northampton Saints."