The Reds centre half is edging ever closer to making a first team return after nearly eight weeks out with a knee injury picked up against Hull City in October.
After forcing his way into Paul Heckingbottom's starting lineup this season and arguably becoming first choice, the injury came at a bad time for Jacko.
But after working with Craig Sedgwick and the medical department, the former Middlesbrough defender feels he's getting closer to being available for selection.
"I'm nearly there now," he said, smiling.
"I'm back training for the first time today actually so hopefully after a couple of weeks with the lads out there I'll be ready and back in.
"I'm buzzing really. When the injury happened I feared that was my season over. But I didn't need the operation and after getting the right treatment I'm feeling good again now.
"I'll not be rushing myself though, I've not set any date or anything. And the other lads at the back have been doing well, I'm happy for Ethan (Pinnock) especially because he's had to be really patient so to come in like he has, he's on fire isn't he, you have to admire that.
"We're a tight bunch in there, I've been to all the home games and Sheff Wednesday away, Sunderland the other day, as I like to support the lads and see how we're getting on. And I think we've really improved lately so I don't see any reason why we can't push on in the second half of the season."
You can see Adam's interview in full over on iFollow.