In-form GIANTS co-captain Phil Davis will miss Friday night's match against the Western Bulldogs with a hamstring injury.

Davis, who has been in outstanding touch in defence for the GIANTS this season, felt a slight twinge at training on Tuesday, and has been ruled out of what looms as the match of the round.

The 26-year-old has been an important player in the back half for the GIANTS, and has shut down Tom Lynch (Gold Coast), Ben Brown (North Melbourne), Charlie Dixon (Port Adelaide), and Lance Franklin (Sydney) over the past month.

Coach Leon Cameron said that at this early stage he expected Davis to only be out for one match.

"It's really, really minor, but you don't want your captain being out for these sorts of games, so that’s really disappointing, but there's an opportunity for another couple of lads to step in," he said.

The club's number two draft pick Tim Taranto looms as the likely replacement for Davis, after he was rested last week, while GIANTS Academy product Harry Himmelberg is another possibility, despite the young defender not playing in the NEAFL last week because of a rib problem.

Academy draftee Harry Perryman has been in consistent form playing as a midfielder in the reserves and could also come into calculations for a debut game against the premiers.

Two incidents from last week's win over the Swans involving Toby Greene and Heath Shaw have taken some of the focus from the club's first blockbuster Friday night game in Canberra.

The Match Review panel cleared Greene after his head clash with Sydney's Isaac Heeney, and Shaw came under criticism for an inappropriate sledge on Tom Papley, for which he later apologised.

Cameron said he has had some good discussions with both men about their on-field behavior over the past two weeks, and in particular Greene, who has come close to attracting the attention of the MRP on more than one occasion.

"He's such a competitor (but) he's got to make sure that in the moment he's got to be able to control that aggression," Cameron said.

"We don't want to lose any players to suspension, let alone guys with the quality of Toby Greene. He's better off playing than sitting on the sidelines, and he knows he has to constantly work on that.

"The one thing that I will say is that I love the way he goes about it, but he does know that when that tipping point comes, he's got to be able to take a deep breath and move onto the next contest."

"Heath (Shaw) knows that his competitiveness can take him over the edge as well, and I was rapt with the way he handled the situation last Saturday night.

"Heath is a knockabout (guy) but he was genuinely remorseful and upset, and was right on the front foot about it, and we move on."

Cameron denied his club had a problem with its discipline, and he hasn't felt the need to address the entire playing group.

"These good quality sides like the Dogs, Hawthorn, Geelong, and Sydney, they play on the edge, and that's probably what we've learnt as a young club,' he said.

"When we were playing them in year two, three, and four, these sides would play on edge, and make sure that their competitive nature was always at a premium, but they know not to tip over the line.

"Sometimes our players tip over, but as long as they keep learning and understanding that you're better off playing every weekend than sitting on the sidelines.

"It's not a group thing, it's been a couple of individuals and they'll be fine."

The GIANTS and the Western Bulldogs clash at UNSW Canberra Oval on Friday, April 28 at 7:50pm, CLICK HERE to purchase your tickets