The effectiveness of DRS at the low downforce Monza track is unknown Sauber boss James Key said.

James Key: Overtaking can be expected in two places, although we don’t know yet how effective the DRS will be in such a low downforce setting. The tyres will be the soft and medium compound, as in Spa-Francorchamps. For the car we will have a modified front wing for low downforce settings and a rear wing specific to Monza.