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

The trustee 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 DeGiacomo expects to file a motion to sell early next week.