Dunn had an arthroscope on his reconstructed knee two weeks ago and began running on Monday.
The 31-year-old previously ruptured the anterior cruciate ligament in his left knee in late June, ruling him out of Collingwood's September campaign and subsequent Grand Final charge.
The veteran backman said he was looking forward to progressing to the next stage of his recovery and getting back out on the ground as quickly as he can.
"I'm confident I'll be able to get back ASAP and I feel as good as I felt. I feel like I'm 22 at the moment and fingers crossed it can stay that way," Dunn said on Wednesday.
"When I come back – whether it's round one (or) whether it's round 10, who knows? ... I can't really set a target at the moment, it's basically on feel."
"If I'm not ready, I'm not ready. I'd certainly rather play the back half of the year rather than the front half of the year like last year."
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Dunn said he had received great support from close mate Tyson Goldsack, who came back to play in the club's finals series after a remarkable recovery from his own ACL injury in the pre-season.
"He's opened a can of worms, which is great, but it's case by case for us," Dunn said.
"Catching the back end of a European summer probably helps. I've never seen a bloke go over to Europe in the middle of a footy season and come back and play in a Grand Final.
"He's been great for me and we've got Matty Scharenberg here as well. It's great to have those guys to lean on and feed off each other."
The Magpies players had the chance to review the Grand Final loss to the Eagles last week and Dunn said the session acted as "closure".
"It was just closure on the day itself," Dunn said.
"We hadn't really spoken about it as players or coaches but I think it's important that we acknowledge what happened and we played a heck of a game.
"In the scheme of things, it doesn't really mean much because we don't have medals hanging around our necks or we don't have a trophy in the cabinet."
Collingwood's men's team joined the Magpies' AFLW team for a joint training session on Wednesday, with Dunn pointing to the one-club mentality as an important thing to build team culture.
