South Launceston's Sam McLean and Mowbray's Sam Freeman will go into the weekend's T20 cup as their sides' frontline spinner despite being aged just 18 and 17 respectively.

A former Kings Meadows High and Launceston College student, McLean began the year playing thirds before winning a call-up in round eight when Knights all-rounder Brodie Jarrad went down with an injury.

He has since collected seven wickets in three games.

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"I got a bit lucky with a few injuries at the club and got a call-up to first-grade and took my chances quite well and performed in my first couple of games," he said.

"I'm not as good a batsman as Brodie but with the ball I've done what I can.

"I used to bowl pace until I was about 14 or 15 and then I didn't grow so I wasn't bowling quick any more and changed to off-spin ... it just worked I suppose.

"I don't turn the ball much so I had to work more on changes in pace and getting more variation in my deliveries than just rely on a stock ball."

McLean made his A-grade debut for South in the 2018-19 T20 cup, collecting 3-37 off eight overs across three games.

He had not played A-grade since before taking 3-23 against Latrobe in November.

"It's been a good experience to get amongst it," he said.

[This weekend] is going to be another learning curve I suppose, an experience and I'll see what I can take out of it and hopefully do well for the side."

Freeman has been Mowbray's leading spinner since older brother Jarrod departed for Lindisfarne at the end of 2017-18.

Having debuted at 14, the year 12 student is the Eagles' third most-capped A-grade player behind coach James Storay and captain Luke Scott. He has recently enjoyed a promotion from the tail to number five after making 40 against Wynyard.

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"It's been a while since I've been batting that high," Freeman said.

"But I found some form coming into the later part of the one-day comps to make some runs and then got the opportunity when that happened - I took the game by throat and tried to do my best when I got that opportunity.

I've been working on my batting - I'm primarily a bowler but you need to have more than one string in your bow.

"I've tried to work on my batting and fielding a little bit and I think it's come a long way since I started out."