Brilliant GIANTS forward Toby Greene has changed his marking technique in the wake of his 'fly-kick' incident on Swans defender Nic Newman last week.

Meanwhile, GIANTS midfield coach Lenny Hayes has expressed his disappointment that the incident overshadowed what he felt was "one of the great finals games."

Greene was cleared by Match Review Officer Michael Christian for the incident, but the MRO said a free kick should have been paid, and that view was communicated by the AFL to the GIANTS.

The 24-year-old had been out with a left hamstring concern suffered in round 20 but returned in brilliant fashion, as Hayes noted to reporters at the MCG on Friday afternoon.

"There's no doubt Toby's going to adjust his technique slightly, and that's come from the AFL saying that if he did that one, the Nic Newman one, then that'd be a free kick," Hayes said.

"In saying that, we love the way he attacks the ball.

"If anything, I was a little bit disappointed that there wasn't more praise for his performance last week. It was one of the great finals games I reckon.

"To miss a month, come out and have 27 (disposals) and kick 3.3, I don't think enough has been made of his performance."

Hayes didn't envision much of an alteration in Greene's approach.

"I don't think it's going to take too much. Most of the time he gets his leg up to protect himself," Hayes said.

"If you look at all those marks, his eyes are on the ball, so I don't think it's going to take too much."

Travelling emergency Harry Perryman trained as the players had a light run at the home of football, where the GIANTS will face Collingwood in a semi-final on Saturday night.

The GIANTS know the crowd will be against them, but they're not fussed.

"We know, having played in the prelim last year (against Richmond), that most of the crowd's going to be against us, but that's OK," Hayes said.

"Once the ball's bounced, I don't think any Collingwood fan's going to be getting a kick for them."

In the absence of star onballer Josh Kelly (right knee), Hayes indicated Tim Taranto, Brett Deledio and Ryan Griffen would spend more time than usual running through the middle.