"He just wasn't in the first batch of guys," Jackson told Cleveland.com at the Senior Bowl. "But he's definitely on our list."
"I'm kind of picking guys," he said. "Some I know on this team that I've been involved with at other places. Some I don't know and want to get to know. There's no rhyme or reason why I haven't talked to (Manziel), but it's just the process I'm in right now. I'm just kind of picking the guys as I go."
Jackson said he's not "directing anything" at Manziel.
"I don't think that's the right thing to do," he said. "One of my philosophies for our organization is talent is important, but character and being a good person and doing the things that we want done as a Cleveland Brown is very important."
Jackson added that he hasn't viewed Manziel's newest videos. He intends to address Manziel's offseason once the two meet.
"One, I haven't watched it to be very honest with you," he told 92.3 The Fan. "Then, No. 2, it is the offseason, and I would hope that players would do a great job of representing themselves and our organization and our team in a positive light. That's what we want.
"And if guys don't, I mean, I think everybody understands and recognizes there's consequences for everything that you do."