The Italian has led the Blues to 12 Premier League wins in a row after an indifferent start.
Chelsea are now favourites for the title, despite finishing tenth last season.
And Duberry, who played at Stamford Bridge in the 90s, has praised how Conte has transformed the Blues.
He told their official website: “Antonio Conte’s start is impressive for many reasons.
“Antonio Conte’s start is impressive”
“A first season in the Premier League taking over a squad in very indifferent form.
“From where they finished last season when they were working below par, to turn it around in such a short space of time, playing a system and formation that they’ve not been used to, all of those little dynamics, is testament to the players, the managers and the club.
Duberry went on to play for the Blues’ next opponents Stoke from 2004 to 2007.
He praised Potters boss Mark Hughes, who he said he knew would always be a manager from when they were team-mates at Chelsea.
“When I was a young lad at Chelsea and Sparky was a senior pro, he didn’t say much off the pitch but when he did it had such an impact,” he added.
“It made all the young lads stand up and listen, and he used to speak so much sense.
“He had words of wisdom.
“When you’re young you think it is the players who are loud and vocal who will go on to be managers, but as you get older you start seeing the traits in managers and the wisdom.
“He had so much knowledge of the game.”