The orange cleats are a violation of the NFL's uniform policy.
Bennett told ESPN 1000's "Football Night in Chicago Show" on Tuesday his teammates warned him of the potential fine before he the took the field.
"(They told me) you know you're going to get fined, right?" Bennett said. "I said 'yeah, I haven't played in a while so I might as well just take this one.' "
"They were too orange I guess."
Bennett caught five passes for 95 yards and a touchdown against the Eagles in his first game back after suffering a serious torso injury in Week 2.
Bears quarterback Jay Cutler, who played with Bennett for one season at Vanderbilt, offered to pay the receiver's fine during an appearance Wednesday on ESPN 1000's "Waddle and Silvy Show."
"Yeah, I'll pick up the tab. Why not?" Cutler said.
Jeff Dickerson covers the Bears for ESPNChicago.com and ESPN 1000.