Johnson, 34, is on a one-year deal but has endured a frustrating season with lower leg problems that have kept him to just nine games.
Eade said Johnson had maintained his pace and that would be a key factor in whether he was capable of fronting up for an 18th AFL season.
“From what I’ve seen at the moment, I think he’s still got enough to go around next year," Eade told afl.com.au.
“Whether he can mentally do that, because we all hit the wall at some stage, and whether it’s been brought on by this year, I don’t know.”
The Bulldogs coach said that although his skipper was realistic enough to know when to call time, he conceded that the decision was “probably not” Johnson’s alone.
“I don’t know where his head is at but he’s a fairly realistic sort of guy. He doesn’t live in a delusional world,” Eade said.
“We’ve made some hard calls on players in the past who thought they wanted to go on and we didn’t think it was best.
“That will be in conjunction with the match committee with what we think is best for the club and the team. His body might not be able to go on so we’d have to make the call.
“He more than anyone will be able to make a realistic call on where he’s at and we’ll take it on board.”
Eade said Johnson was on top of the achilles problem he developed in the pre-season but may face surgery to repair the ankle that had also recently troubled him.
Hall, 33, is in the first season of a two-year deal and has kicked kicked 65 goals in 17 games this year and is easily the club’s leading goal-kicker from Daniel Giansiracusa, who is on 24.
Eade said that based on current form the big forward may deserve another contract at the end of next year but warned the landscape could easily change before then.
“With guys at that age it’s always difficult because it can finish pretty quickly. If you look at him now, you’d think not only will he have next year, but he’ll have the year after,” he said.
“Things can change pretty quickly for a 33-year-old. It will be judged next year on how he goes. It’s probably too early to call.
“Fitness-wise, he’s pretty good. A 33-year-old is going to get some aches and pains at times.
“Not going to Darwin helped him, having a break, and looking at next year, he might need two or three games off at some stage. The two byes next year will help as well.”
Eade also indicated Johnson should consider handing off the captaincy for next season should he play on.
“I thought at the start of the year, even with Brad being fit, that if he had another year to go, it might be best for him to enjoy that year without the pressure,” he said.
“It might be best for him if he played on after the frustration with his body this year to just play a year without any stress.
“We’ve certainly got some good candidates if Brad decides he doesn’t want to be captain.”
Johnson has been captain since 2006. He is currently supported by the leadership group consisting of Matthew Boyd, Daniel Giansiracusa, Daniel Cross, Rob Murphy, Dale Morris and Shaun Higgins.
