Both fighters have agreed to the matchup and are looking forward to signing their bout agreements, reports MMAWeekly.com.
Barry and Hardonk are both coming off disappointing losses after strong efforts.
Hardonk was unbeaten in three UFC fights in 2008 but in April at UFC 97 suffered a TKO loss to Cheick Kongo. Last month Hardonk had another fight in Los Angeles, when he prevented three men from stealing a victim's wallet with a threat of a knife.
A former K-1 and WCL kickboxer, Barry made an impression in his UFC debut, forcing an end to the fight in the first round by chopping Dan Evensen with leg kicks. However in his next fight, his inexperience in grappling was on display when he was tapped out by UFC newcomer Tim Hague at UFC 98 in May.