Broadfoot was one of a host of high-profile names to leave the Ibrox club following their demotion to the Scottish Third Division.
According to Eurosport, the 28-year-old has agreed to join Ian Holloway's Tangerines and the Championship side are close to finalising the deal.
Holloway said: "We are hoping to have Broadfoot with us shortly. We'll see if we can get that deal done early this week."
Broadfoot made 80 appearances for Rangers over a five-year spell.