Rugby league's Golden Boot winner Greg Inglis has some scary news for opposing teams - he can get still get a lot better.

Inglis returned home on Wednesday from the Kangaroos' Four Nations triumph in England still coming to terms with his "ultimate" 2009 season.

In addition to winning the NRL premiership with Melbourne, Inglis was a key figure in Queensland's record-breaking State of Origin series win and an integral member of the Kangaroos side.

His slew of individual honours include the Golden Boot as world player of the year, Four Nations player of the tournament and Queensland's Origin man of the series.

Throw in the Dally M centre, representative player of the year and international centre of the year and there can be no doubt that the 22-year-old is the world's best player.

It's a year which compares favourably with Darren Lockyer's fabulous 2006 when he captained Queensland's Origin win, Brisbane's NRL premiership and Australia's Tri Nations triumph, scoring the winning try in extra time in that final.

It was a humble but determined Inglis who met reporters at Sydney airport, where he gave no indication of resting on his laurels.

"(It) the Golden Boot was a good way to end the year, a pretty big year for myself," Inglis said.

"I think there's still a lot of improvement in my game, just little areas."

Pressed on what those areas were a coy Inglis replied: "Just behind the scenes, I've just got to put my head down."

Kangaroos coach Tim Sheens joked that he hoped Inglis would save his improvements for Australia and spare his own Wests Tigers team.

"He's young and he's keen and he's fit, there's every reason to say the more experience he gets the better he will be," said Sheens, who also believed Inglis should not shift from the centre position he dominates.

Inglis' club, state and national teammate Cameron Smith was looking forward to seeing what more the backline superstar had in store.

" It's not frightening for me because I play in every team he plays in," said Smith.

"It's a great thing for us but I think a lot of people forget that he is only a young guy, he's 22, he's got a lot of improvement left in him.

"I think it only spells danger for opposition teams."

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