SYDNEY forward Gary Rohan has been cleared of any structural damage and will be discharged from hospital on Sunday.

The 25-year-old was knocked out after a sickening collision with Carlton defender Sam Rowe at the MCG on Saturday afternoon and spent the night at Epworth Hospital.

A Swans spokesperson told AFL.com.au that Rohan suffered concussion in the incident and was likely to fly back to Sydney on Sunday.

Rohan took to social media to thank fans for the outpouring of support.

"Thanks everyone for the well wishes. Scans came back all clear, just got a sore head, neck and back," Rohan posted on Instagram on Sunday morning.

"On a plus side, (I) got a good view from (the) hospital bed."

The club had earlier reported Rohan was alert in the rooms soon after the nasty fall and was taken to hospital for precautionary scans. 

Midway through the third quarter, with Carlton building a lead, Rohan showed great courage to run with the flight of the ball to contest an aerial ball. 

However, after coming into contact with Rowe – who approached the contest from the opposite direction – Rohan landed awkwardly on the back of his neck. 

The Swans forward lay unconscious and motionless for about a minute as the motorised stretcher was immediately brought onto the field. 

Play was held up for five minutes as Rohan was carefully removed from the turf. 

Unto that moment, the 81-gamer had been enduring a forgettable, two-possession afternoon. 

The Swans look set to be without Rohan for next week's clash with the Brisbane Lions at the SCG and coach John Longmire said it was difficult to watch the incident from the coaches' box.

 "From my understanding he's having precautionary scans. He's moving OK, he's awake and he's having precautionary scans," he said. 

"It obviously didn't look good and it looked as though he was in a bit of trouble for quite a while. That's the thing you notice. Normally when a player cops that sort of hit they're able to get up pretty quickly but he certainly didn't look like he was moving too flash." 

The motorised medical cart sped onto the field to attend to Rohan before the umpire had called a halt to play after the incident, which drew some queries from commentators, but Longmire said he did not notice its early appearance.