The Warriors prop was called up as 18th man for last week's game in Brisbane but wasn't required as Queensland levelled the series 1-1.
The 29-year-old has played six times for the Maroons, with the last appearance in 2011, but his callup was reward for some powerful recent performances for the Warriors.
Lillyman has averaged 102m a game this season but three times in the last four games has exceeded 150m. He did it again on Sunday against the Broncos when he ran for 152m and backed it up with 33 tackles and an impressive three tackle breaks.
He is one member of a four-strong prop rotation that is one of the best in the NRL but the quartet had to do without Russell Packer against Brisbane and Packer (hamstring) is a doubt for Sunday's game against the table-topping Rabbitohs in Perth.
Ben Matulino (150m), Sam Rapira (161m) and Lillyman made up for Packer's absence - Warriors coach Matt Elliott doesn't seem to have confidence in Suaia Matagi who played only the first 15 minutes against Brisbane - and the trio will need to be equally effective on Sunday against a big and bruising South pack.
It's a matchup Lillyman is relishing and it will help knowing the Origin selectors will be watching his performance closely.
"The biggest thing is knowing you are thereabouts and in their minds," Lillyman said. "Had I not been called up and had a chat to [coach] Mal [Meninga] I wouldn't know where I was in the mix. It's a bit of a feather in the cap.
"In the last five weeks I have started to turn a bit of a corner. I have got over a niggling injury I had and am starting to get some good numbers. It's just good the body is in good nick and feeling fit."
It's a sentiment shared by most at the Warriors, although winger Manu Vatuvei and Packer are doubts for Sunday's game. Both have been included in the side to face the Rabbitohs in the hope they will be fit to play but Elliott has named an extended seven-man bench to cover all options.
That includes Ngani Laumape, who would replace Vatuvei, and backup props Matagi and Charlie Gubb.
"Hopefully they'll be fine to play this weekend," Elliott said. "Manu has a contusion on his [right] shin which is responding to treatment while Russell is also a chance to return."
The Warriors are chasing their sixth-straight win which would equal their second best run as a club - the best is eight achieved in 2002 - but they face a side on their own four-game winning run and sitting four points clear of the Roosters at the top of the table.
But Lillyman said they had nothing to fear.
"The good thing about what we went through at the start of the year is that we want more," he said. "We are climbing the hill now and we don't want to fall back a few steps. We are going to try to ride this high as long as we can."
Warriors side to play Souths at NIB Stadium, Perth, on Sunday (8.30pm NZT): Kevin Locke, Glen Fisiiahi, Dane Nielsen, Konrad Hurrell, Manu Vatuvei, Thomas Leuluai, Shaun Johnson, Sam Rapira, Nathan Friend, Ben Matulino, Feleti Mateo, Simon Mannering (c), Elijah Taylor, Interchange: Russell Packer, Jacob Lillyman, Todd Lowrie, Dominique Peyroux, Ngani Laumape, Suaia Matagi, Charlie Gubb.
- Michael Brown of APNZ
