"Yeah, I was, I haven't really had too many knee injuries," he said.

"So I was a bit worried."

The 22-year-old sat on a massage table in the ANZ Stadium dressing sheds in the aftermath of Wednesday's 23-18 loss, receiving treatment from the NSW medical staff when he received the best news he had heard all night.

The Kiama flyer had suffered a grade two medial ligament tear in his left leg, but would be sidelined for only four weeks.

"It turned out as the best case scenario," Morris said. "I'll have a bit of time off and give it some rehab and I don't really want to rush it too much.

"I've had a big year so far, over the last two years really, so it could be a blessing in disguise to be fresh for the finals."

Morris has scored 14 tries in as many games this year, but only three in the past six weeks.

The pain of his injury only added to the bitter disappointment of dropping Jarryd Hayne's pass when a try beckoned in the 58th minute.

But after ending his first Origin without a four-pointer, Morris said he was looking forward to returning for the Dragons' looming finals campaign.

"It's not the way you want to finish the series, definitely not," he said.

"But in saying that, I can go back to the Dragons now and that's my main focus."

Morris has already earmarked the clash against the Roosters at the SCG on August 8 for his return.

He is likely to be replaced by Kalifa Fai Fai Loa for next Friday's showdown against traditional and top-eight rivals South Sydney.

The 20-year-old has impressed in his two NRL starts this year and scored a double in St George Illawarra's loss to Penrith.