Heralded as one of the biggest signings in South Sydney's long history, Greg Inglis will use the run into the NRL finals to show just why his signature drew so much fanfare, according to coach John Lang.

Finally over the barriers posed by lack of fitness, injury and State of Origin commitments, Inglis' second half efforts against Sydney Roosters in Saturday night's 21-20 golden point win suggested Lang may be spot on.

"He's had a funny season Greg - he was very underdone at the start of the season and then he was injured and then he had the State of Origin," Lang said of Inglis, who scored the try which sent the clash with the Roosters into extra time.

"It's been hard for Greg and for us to develop how we're going to use him because he's been in and out of the side and often not training because of State of Origin.

"It's been difficult for us, it's been difficult for him but I think we'll really see the best value out of him over the next seven games."

Rabbitohs fans can only hope so with the club walking the finals tightrope heading into the home stretch.

The win over the Roosters left the Redfern-based club just two points out of the top eight, with Lang threatening to make more use of the powerful, pacy Inglis' obvious talents.

"We've got to get him the ball with a little bit of room to move and when we do that he's dangerous," Lang said.

"We're working on different things to get him more involved rather than him just sit out wide all the time - we probably want to get him the ball rather than him coming looking for the ball."

Inglis stepped into second receiver on occasions against the Roosters, but the Test and Queensland Origin star said he would have a roaming commission more akin to that of Parramatta fullback Jarryd Hayne.

"I think just trying to get around, floating pretty much as a second fullback," Inglis said.

"It has been difficult for the last two months because of the Origin period, but that should be no excuse, I should be coming back. I've been playing with this team all year and I should be fitting in well now.

"We went in with a gameplan (against the Roosters) of getting the ball out to me a bit more but it just didn't happen in the first half."

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