A method and apparatus for producing direct reduced iron, said method comprising producing direct reduced iron using a pre-treated make-up gas as a reducing agent in a direct reduced iron reactor (10), and wherein producing direct reduced iron is carried-out using a zero-reformer process in which catalytic reformation of the pre-treated make-up gas is carried-out "in situ" within the direct reduced iron reactor (10) such that the pre-treated make-up gas is subjected to no further catalytic reaction besides the catalytic reactions that occur inside said direct reduced iron reactor (10),characterized in thatsaid method comprises: - pre-treating a stream of said make-up gas containing heavy hydrocarbons by subjecting the stream of make-up gas to a low temperature adiabatic reforming at a temperature comprised between 300°C and 600°C, prior to using said stream of make-up gas as a reducing agent for producing direct reduced iron; - subjecting said pre-treated stream of make-up gas to adjusting humidity content of said stream of make-up gas after said low temperature adiabatic reforming by bypassing said stream of make-up gas to selectively split said stream into a first part (128) of said stream of make-up gas and a second part (130) of said stream of make-up gas and subjecting said first part (128) to a water separation and then mixing said first part (128) to said second part (130) to obtain a reducing stream (146) to be sent to direct reduced iron production.