The Victorian Opposition has launched a strident attack on allegations, published in The Age that a false invoice for $10,000 was issued in 2013 to give a developer exclusive access to then-planning minister Matthew Guy.

On Tuesday morning Mr Guy, who is now Opposition Leader, rubbished reports that his deputy David Hodgett directed the developer to place the donation into his electorate branch.

Mr Guy launched an extraordinary attack on The Age's coverage, which he slammed as "fake news" and "utterly untrue".

"My side of politics is sick to death of the Australian Labor Party and The Age concocting stories out of nothing to make them into some sort of incredible scandal that is frankly completely and utterly untrue," he said.