Informed sources close to the situation report that the American has agreed to a five-round fight in the main event of the event, and is now awaiting a response from the French side.
Benil Dariush, 34, suffered two straight defeats last year, losing by first-round knockouts to Charles Oliveira and Arman Tsarukyan.
Benoit Saint-Denis, 28, is riding a streak of five early wins in the UFC, knocking out Matt Frevola as early as the first round in his last fight.
Benil Dariush and Benoit Saint-Denis are currently ranked seventh and twelfth in the UFC lightweight division rankings, respectively.