Bath chief executive Bob Calleja says his players will not be made available to England on non-international weeks during the Six Nations. England coach Andy Robinson wants to keep his squad together for a block of eight weeks over the Six Nations.
"There is no deal to release players for extra training days before or during the Six Nations," said Calleja.
The RFU insists England players should not be released for the Powergen Cup semi-finals on 4 March.
"We are anticipating full-strength Bath sides for our home games against Wasps on 28 January, against London Irish on 18 February as well as for our semi-final in the Powergen Cup against Llanelli Scarlets."
Robinson does not want players turning out for their clubs the weekend before England begin their Six Nations campaign against Wales on 4 February, or the two blank weekends during the championship.
The RFU is trying to thrash out a strategic plan leading through the Six Nations and targeting a successful World Cup defence in 2007.
But RFU officials and the club's umbrella body Premier Rugby are locked in a bitter civil war over the management of elite players.
The clubs agreed to England having an extra week's preparation ahead of the autumn internationals - but they fail to understand why Robinson needs so long to work with his players.
Unless an agreement can be reached for the Six Nations, Robinson's first real access to his England squad will be on the Monday before they tackle Wales.
He will then lose the players for two weeks during the campaign.
Robinson has previously explained the need for England to be given added time because "it's as if we are going to the Olympic Games".