
Northampton have become the second club to take issue with the Rugby Football Union over its approach to building a new England coaching team.
The new England boss Eddie Jones has identified Saints backs coach Alex King as his final appointment, joining Steve Borthwick and Paul Gustard.
However, Bristol say they have not given Borthwick permission to leave.
And Saints boss Jim Mallinder says Saints have been "kept in the dark" about any approach for King.
Northampton say they have "had no formal approach" from the RFU - something described as "disappointing" by Mallinder - and could make an official complaint.
Jones has met with former England, Wasps and Clermont fly-half King but Mallinder is unaware of the contents of their conversation.