Citroën's Hypnos concept has a 200 bhp (147 kW) diesel-electric hybrid powertrain with low fuel consumption and emissions (4.5litres/100 km and 120g/km of CO2).

The automakers said the "beautifully proportioned" car combines coupé styling with saloon elegance and SUV interior space.

French executives have said the powertrain will be used in a production model soon.