MMAjunkie.com (www.mmajunkie.com) has learned from sources close to the promotion that Florian suffered an undisclosed injury while training for a planned matchup with Dunham and has been forced to withdraw from the bout.
The pair was expected to meet in the main event of "UFC Fight Night 23: UFC Fight for the Troops 2," which takes place Jan. 22 at Fort Hood in Killeen, Texas.
The UFC has yet to announce the change, and it's currently unknown whether a replacement opponent will be found or if the matchup will be pushed back to a later date.
Florian's manager, Malki Kawa, declined to comment on the report when contacted by MMAjunkie.com.
Florian is coming off a unanimous decision loss to Gray Maynard at UFC 118.