There are various reasons why additional support may become necessary. Presumably, the wall thickness is not sufficient for the required bearing width or the load-bearing capacity of the wall is not sufficient.
However, I would assess the previously specified HEA 160 profile as not yet statically dimensioned. It seems quite small to me. Please also consider how you will maneuver a 3.00m long profile inside the house. An HEA 160 already weighs over 90kg at 3.00m!
As a precaution, have the structural engineer design one or two bending-stiff joints, depending on how long the pieces can be for handling inside the house.