He was then taken by ambulance to hospital for further assessment, accompanied by the Sri Lanka team manager, while his father and sister are believed to have travelled in a separate vehicle.
Sri Lanka coach Chandika Hathurusingha later had good news about the batsman's condition, saying he had never lost consciousness and that he was in good spirits while he was being assessed at the hospital.
Only 24 hours earlier, Travis Head choked back tears in a post-match interview in which he revealed he had dedicated his maiden Test century to Hughes, his former South Australia teammate. "The good thing was he looked like he was moving his hands and the physio said he seemed all right when he left". "I wish him all the best and I hope he's doing alright".
"I'm comfortable with how that played out but at the same time I acknowledge not everyone will agree with me".
That ended Sri Lanka's solid opening stand, the best from a visiting team in Australia since England's Alastair Cook and Michael Carberry put on 85 in Perth in December 2013.
Pucovski, 20, earned his first call-up for the home series against Sri Lanka after returning from an "indefinite break" from cricket for treatment on a mental health-related illness.
A visibly concerned Cummins approached Karunaratne to check on his opponent as he was taken from the ground.
The incident appeared to rattle Sri Lanka, who went from 0-82 at the time to 3-123 at stumps in reply to Australia's 5 (dec)-534. Some loose bowling on a batting friendly wicket saw both Patterson and Paine smash 14 boundaries in their stay on the wicket.
The 25-year-old Patterson also strung two crucial partnerships of 68 with Joe Burns (180) and 130 with skipper Tim Paine (45) to take Australia to a mammoth first innings total. The last wicket to fall on the day was Chandimal, who flirted with danger and edged a ball pitched outside off by Starc and was out for 15.