If you noticed something different about Callum Sinclair's match-day attire then you were spot on, with the ruckman donning orange laces in support of a campaign that rings close to home.

The tiny but powerful gesture was in support of 'Step Back. Think', a non-for-profit organisation focused on the prevention of social violence.

By wearing the commemorative laces, Sinclair joined many Australia-wide who'll do the same this week as part of Team Lace Up which aims to help raise awareness and of the causes and consequences of social violence within the community encompassing coward punches, one-punch assaults, street fights and schoolyard confrontations.

Over 40,000 individuals across a range of different sporting codes, leagues, clubs and ages around Australia are expected to wear the laces during play as part of 'Lace Up Week'.

Team Lace Up Ambassadors Tohu Harris (Melbourne Storm), Marc Murphy (Carlton) and the entire Greater Western Sydney team will join the chorus in their respective matches on Saturday.

Sinclair's involvement stems from his sister-in-law, Elisha, who's brother, Shannon McCormick, was the victim of a coward punch in 2007.

"Wearing these laces is just a small token for her and her family," Sinclair said.

"They've obviously gone through a tough time so this is all for them."

For more information on 'Step Back. Think' and the 'Team Lace Up' campaign, please visit www.stepbackthink.org/news/general/team-lace-up/