GREATER Western Sydney coach Leon Cameron will have "a chat" to Toby Greene about his striking report against Richmond, conceding the All Australian forward has yet to learn from past disciplinary lapses.

Greene was reported in the first quarter of the Giants' 19-point loss at the MCG on Sunday for striking Tiger defender Alex Rance.

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GWS forward Steve Johnson was set to have a 20m shot on goal before the incident after receiving a free kick for a high bump from Rance.

Greene then threw a jumper punch in retaliation that appeared to catch Rance on the chin, prompting the umpires to reverse the free kick.

Greene is facing his second suspension of 2017, following a two-match ban for striking Western Bulldogs midfielder Caleb Daniel in round six.

Five talking points: Undisciplined Toby in trouble again

The forward has also been fined $1000 twice this season, for misconduct against North Melbourne defender Sam Wright in the JLT Community Series and for striking Port Adelaide's Dan Houston in round four.

Cameron said Greene's on-field discipline had improved in the wake of his recent suspension, but Sunday's relapse meant it would have to be addressed again.

"It's disappointing. I can't sit here and hide from it. We have to look at that discipline part of our game because there were 50m (penalties against Richmond) that cost us," he said.

"I must admit it had got a lot better, but in today's game it reared its head and I'm disappointed that Toby has played his part in that.

WATCH: Leon Cameron's full post-match media conference

"I'll back him into the hilt every day of the week and we have to have a chat again Monday (or) Tuesday about it because it's just flattening and clearly it can break momentum."

"This young kid is worth spending time with because I know his heart's in the right spot and that is he wants to play footy for this footy club from minute one to minute 120, but there are some areas in his game that he needs to tidy up." 

Further salt was sprinkled into the Giants' wounds late in Sunday's game when midfield star Dylan Shiel came off the ground nursing his right shoulder.

Cameron was hopeful scans would show Shiel's injury was minor, but conceded the midfielder's shoulder had regularly been dislocated in recent seasons.

"It didn't look all that great, but his shoulder has been a little bit of an issue for a little while. Hopefully it's just minor but no doubt we'll find out over the next 24-48 hours," Cameron said.

"Sometimes it does (pop in and out). It's got a lot better. He's had that for three or four years, he's had a couple of shoulder operations so he learns to push through that each game.

"But sometimes there are bigger knocks than others and there's no doubt he was a bit sore at the end of the game."

Cameron said his team did not deserve to sit third on the ladder after Sunday's loss.

The Giants have won just one of their past six matches – but have had two draws – and the GWS coach said they had to address their mindset and decision-making.

"We've got to find our mojo because clearly it's only spasmodically coming out for patches of the game," Cameron said.

"If we don't find our ability to go the distance and do the hard things for longer periods in the game we'll quickly lose that spot on the ladder."

Cameron was hopeful Stephen Coniglio would return next Saturday against Fremantle after the midfielder played 75 per cent game time in his return in the NEAFL this weekend.