Channel Seven has launched an internal investigation into allegations of "inappropriate behaviour" by senior journalist Robert Ovadia.

A network spokesperson confirmed Ovadia was on leave and said "Seven is conducting an investigation into allegations of inappropriate behaviour by Robert Ovadia".

In a statement to the ABC, Ovadia said he would defend the "malicious" allegations.

"Seven has told me no current or former colleague has made any complaint against me," he said.

"As far as I am aware, I have not been stood down by the company.

"Any suggestion I have behaved inappropriately at any time is false, malicious and will be defended."

The Sydney-based crime reporter has been with the network for more than 20 years.

In a separate move, the network announced the departure of its Sydney newsroom chief of staff Andrew Frampton this week.

An email sent to staff on Friday described Frampton's departure as "amicable" and thanked him for his many years of service.

"Andrew's departure comes as we restructure into a digital first newsroom and it was entirely amicable and on good terms," the email read.

"We wish him all the best in his next endeavour, which we're sure he'll excel at."

Frampton is not accused of any misconduct.