De Koning was not involved in Saturday's 3-0 home win over Brighton, and the Chief Executive says: "There were disagreements between the management team at the Coventry game which have not yet been resolved.
"As a result, and because we have no game for the next 14 days due to this weekend being set aside for international fixtures, John Rudge and Jan De Koning have taken a week's leave.
"We would expect to resolve the situation upon their return to the club next week. The management team have had a good working relationship up to this point and we hope that it can continue."