Case Keefer of the Las Vegas Sun reported the news on Wednesday afternoon after receiving confirmation from UFC officials.
Duffee (7-2) was released from the UFC in 2010 after UFC President Dana White said he didn't like Duffee's attitude. Since his release, the Indiana native has compiled a 1-1 record with the lone win coming against Neil Grove last April.
The highlight of Duffee's nine-fight career is his seven-second knockout of Tim Hague at UFC 102 in August of 2009.
De Fries (9-1, 1 NC) is coming off a second-round submission of Oli Thompson at UFC on FOX 4 last August. The 26-year-old has won two of three fights in the Octagon and will try to string together consecutive wins for the first time in his UFC career.
UFC 155: ‘Dos Santos vs. Velasquez II' goes down Dec. 29, 2012 from the MGM Grand Garden Arena in Las Vegas, Nevada. The event is headlined by a heavyweight championship rematch between Junior dos Santos and Cain Velasquez.