Lion James Curran and Shamrock Alex Kerrison both failed to reach the two-game qualification standard after sitting out last weekend with injury, while Westbury's other gun spinner Kieren Hume would have played but for being forced to quarantine after returning from Brisbane.

Nevertheless, both sides will go in confident of capturing the first flag of the season.

Alistair Taylor's Launceston is shooting for a third-straight T20 cup after overpowering Riverside two years running, while the Shamrocks kickstarted their two-year domination of one-day and two-day cricket with the 2017-18 20-over title.

A super over was all that could separate the two sides last weekend as the Lions held their nerve to finish the weekend 4-0.

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"It was a ripping game of cricket - we lost it and then we won it, then we lost it, then we tied it then we won it - that's how it went," Taylor said.

"They're a good club, they always play hard so we're looking forward to it.

"You want to test yourself in big games against the best opposition and they've been setting the standards in all formats for the last few years so it's going to be a really good game of cricket."

Westbury trod an unconventional path to qualify for Thursday's final.

The only side not to register a win on the opening day of matches, Dan Murfet's Shamrocks routed Riverside and Mowbray on day two to sail through on net run rate.

Murfet praised young seamer Alex Jordan, who conceded just 62 runs in 16 overs last weekend, and veteran John Kedey for their roles in getting the Shamrocks through to the decider.

"We're pretty happy with how we turned things around from Saturday to get through Sunday," Murfet said.

"I think Launny are a side that always strive to do well in the T20s - they've usually got a decent squad to pick from so I was pretty happy we were able to pull off a draw against them.

"We just try to have some fun with the T20s and play some good cricket at the same time and we've got ourselves into a final.

"It'll be no different Thursday night, but I think we'll take some confidence that we matched it with Launny there on Saturday."

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The Shamrocks will have two big inclusions from when the two sides last met, with Greater Northern Raiders pair Jono Chapman and Oli Wood both named in a 12-player squad.

Chapman in particular wasted no time settling back into Westbury colours, snagging 5-16 in the Shamrocks' T20 win over Riverside.

"He's a big leader in our squad," Murfet said.

"Even though he plays a lot with the Raiders now he's still just as heavily involved on a training and playing basis when he can, so it's good having him about and great having Oli come back as well who's doing a great job leading the Raiders."

The game starts at 5.30pm at the NTCA No.1 ground.