Robins manager Lee Johnson played with the England left-back during a loan spell six seasons ago.
"I swear to God, I think he [Bryan] is potentially the best left-back in the division and he can go as high as he wants," Johnson told the Bristol Post.
Bristol City's Danny Rose (L) battles with Preston North End's Billy Jones (R) as Preston North End's manager Darren Ferguson looks on
"I remember seeing Danny Rose when he was at Bristol City a few years back and I honestly think Joe has got more than him (at that stage).
"That is saying something, because Danny Rose is currently the England left-back! I believe hugely in Joe in whatever position he plays and I think people are starting to see the reason for that more and more. Hopefully, they are starting to see why I'm doing what I'm doing."
Like Rose, Bryan has moved to left back over the last couple of years having featured predominantly as a winger for much of his earlier career. And at the age of 22, he has already turned heads helping Bristol City to the League One trophy in 2015 and finding himself named in the division's team of the season for a season where he scored seven times in 50 matches.
Bristol City's Joe Bryan in action with West Brom's James Chester
And though Johnson was quick to pour praise on Bryan, he was also eager to point out that he's not the finished article after the club's narrow 1-0 defeat to Norwich City.
"He's still learning the role and maybe he's not the best left-back yet, but I think he will be," Johnson added. "He was excellent – strong, competitive, good in his one versus ones and good in terms of the quality of his crosses.
"Joe is still learning the position, but he is learning it fast. He is getting better and better and I believe he has every attribute needed to become a top left-back."
Wales' Aaron Ramsey in action with England's Danny Rose
Rose was around Bryan's age when he featured at Ashton Gate, and was very much a winger in those days. Though Bryan has been a stand out player for Bristol City over the last couple of campaigns, there is no denying the progress Rose has made as a left back, both as he won a starting spot under Andre Villas-Boas and then especially working under current boss Mauricio Pochettino. It wasn't a simple switch for the Spurs man, and only recently can it be said that he is a confident and consistent defensive performer.
Johnson's comments on Bryan are certainly an indication of his talents, and he still has three or four years to try and push on and reach the level Rose is currently at. His manager will certainly be hoping he can help his side do so by driving them into the Premier League.