The goalkeeper lost his place to Andy Lonergan after he was ruled out for several months with a knee injury earlier in the season.
However, Bogdan has been in impressive form since regaining his spot in the team and Ream believes that the Hungary international is playing the best football of his career.
"Some would say he's looked a different keeper since he came back, for whatever reason, I couldn't tell you," he told the Bolton News.
"He hasn't really changed anything but he's playing with a confidence right now that I don't think anyone has really seen since he stepped in as number one two years ago.
"Before his injury he was coming for crosses and maybe dropping a couple – now they are sticking. He hasn't really made a bad decision. He's done incredibly well since he came back in and it has helped us a lot."