Sources close to the fight notified GatewayMMA.com of the change earlier tonight.
Combs is riding a three-fight losing streak, and he was coming in looking for his first win since 2010.
Dent had snapped a three-fight losing streak of his own less than two weeks ago when he picked up a submission victory at an event in Iowa.
Bellator 66 will be headlined by a lightweight rematch between former Bellator champion Eddie Alvarez and current DREAM champion Shinya Aoki and will also feature local fighters Brian Rogers, Jessica Eye, Dan Spohn, Donny Walker, and more.
Stay tuned to GatewayMMA.com for more on Bellator 66.