Bath have been charged by Premiership Rugby for releasing No.8 Toby Faletau to play for Wales against South Africa last Saturday.
Faletau, 27, stayed on with the national side for Wales’ 24-22 win over South Africa, which was the only international to be played after November 25 – and therefore outside of the Test window.
The Premiership’s policy states that clubs are not allowed to release players for national duty outside specific periods set for international matches by World Rugby.
And in a statement, the club says: “Bath Rugby have seven days to respond to the allegation and once that time has passed Premiership Rugby will issue a further update.”
Last week, Bath head coach Todd Blackadder said the club were expecting punishment for allowing Faletau to stay with the national team.