Greg Inglis has vowed he'll be ready for round one to begin delivering on a promise to take South Sydney deep into the NRL finals.

A fit-looking Inglis reported for his first official day as a Rabbitoh confident he is in good shape and will be completely over shoulder and hip complaints for a first-up grudge match against the Sydney Roosters.

Inglis has battled weight problems for the past three seasons after playing the early portion of his career at around 100kg.

He was described by former Brisbane Broncos fitness guru Dean Benton last week as a bad buy as he was out of shape.

But the Queensland and Australian representative put that issue to bed on Tuesday when he cut a trim figure in his new Souths gear.

Inglis says he is already at his ideal playing weight of 112kg despite an injury-disrupted off-season and plans to start running freely in a fortnight.

"I don't know who the hell (Benton) is, or what he does, or what he does these days, but my weight is perfectly fine," Inglis, who admitted he will not be fit for next month's All Stars clash, told reporters.

"I'm back to 112 kilos, finishing what I started off last year - I played the whole season at 112 kilos.

"I think (the All Star game is) too soon (but) I'll be definitely back first round, fingers crossed. And fingers crossed I get to play one trial as well."

Inglis believes Souths can build on last season, when they narrowly missed out on a finals appearance while finishing a respectable ninth, and backed them to feature deep into September.

And he's aware of the pressure as the star player trying to deliver results to a club that has not tasted premiership success in 40 years.

"Obviously Souths is a growing club with a lot of young guys and a lot of potential as well," he added.

"They haven't had success for a number of years but hopefully we can go through the whole finals series (this year).

"Obviously (there is) the pressure, the demands of people looking at me, hopefully I can deliver.

"They missed out on (the finals last year), but in saying that I think it will be a great opportunity for me as well, and for the club to ... keep moving forward.

"They are a growing club and they will continue to grow even bigger and stronger."

Rabbitohs skipper Roy Asotasi, who officially welcomed Inglis to the foundation club with a handshake in front of a healthy group of vocal fans, said Inglis could be the X-factor needed to take Souths to the next level.

"We've seen what he's done for the Storm and his state and country over the last couple of years," Asotasi said.

"We need everyone to be on board and there's no doubt that he'll add a whole new dimension to our side but we just need to learn how to play well with each other."

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