Tasmanian Premier Will Hodgman says a relationship between the state's primary industries minister her departmental head is a "recent thing".
Liberal MP Sarah Courtney stood down from her portfolios on Tuesday after revealing she had started a relationship with Department of Primary Industries, Water and Energy Secretary John Whittington.
Mr Hodgman was grilled during question time on Wednesday over when the pair's relationship began.
"It is true to say absolutely, that the first I knew of this was on Sunday," he said.
"With respect to the extent of time in which this relationship has been developing as has been said, it is a recent thing."
Ms Courtney has stepped aside while potential conflicts of interests are independently reviewed.
Dr Whittington has taken leave from his position.
During a firey question time, Labor asked Mr Hodgman whether he knew of a request by Dr Whittington to work two days a week in Launceston, where Ms Courtney - the member for Bass - lives.
"It would be a sensible thing for the senior officials, including Dr Whittington perhaps, to spend some time where so many staff are based," Mr Hodgman said, adding he would seek further advice on the apparent request.
Ms Courtney and Dr Whittington travelled together to Asia on a trade mission in September.
Greens leader Cassy O'Connor said every decision made by Ms Courtney as a minister was now under a cloud.
"As to decisions made by the minister, they will be appropriately assessed," Mr Hodgman replied.
"That will occur in due course and as quickly as possible."
The head of the state service is reviewing ministerial decisions made by Ms Courtney and considering whether a code of conduct investigation is needed.
Ms Courtney, member for Bass, was appointed Tasmania's first female primary industries minister, as well as racing minister, in March after the Liberals' re-election.
Australian Associated Press