Theekshana has been one of the breakout stars of the Twenty20 World Cup, taking eight wickets in Sri Lanka’s initial pool games.
However he missed their last-up start against Bangladesh through injury, and was again rested from training ahead of Thursday night’s clash with Australia.
But coach Mickey Arthur does expect him to play on Thursday in a massive boost for the Sri Lankans.
The 21-year-old has played just seven internationals for Sri Lanka in both white-ball formats, but has the ability to spin the ball both ways.
Sri Lanka have also made no secret about their plan to go after Australia with spinners, with Aaron Finch’s men expecting to face up to 12 overs of slower bowling.