Sri Lanka Cricket (SLC) released a statement regarding Karunaratne’s injury.
"Dimuth has been discharged from Canberra hospital following assessment and all cleared. A further update will be provided on his playing status tomorrow prior to play," the statement read.
Playing in his 58th Test, Karunaratne was 46 not out when the rising ball glanced off his shoulder and onto his helmet, close to the neck area.
He slumped to the ground, dropping his bat as Australian players ran to assist.
A doctor and physio sprinted onto the ground and called for more medics and after some 10 minutes he was put onto a stretcher and taken off the field on a golf buggy before being sent to hospital for checks.
Coach Chandika Hathurusingha said he was "in good spirits" and in "no danger".
"It was a bit scary at the start the way he fell back, but he was okay throughout, he was talking to the umpires and the physio," he said after play ended for the day.
"It hit on the back of the neck so he is being assessed."
First Published: February 2, 2019, 12:31 PM IST