More than 40 potential bidders have expressed interest in buying the Upper Crust pizza business, according to Mark DeGiacomo, the trustee overseeing the bankruptcy of the Boston-based chain.

DeGiacomo plans to auction off leases for all 10 shuttered Upper Crust stores that are part of the bankruptcy, as well as related assets at each location. Details of the auction are still being worked out, but the trustee plans to file a motion to sell early next week.