A new two-door Opel could be on the way.

General Motors' Opel brand will reportedly use this fall's Frankfurt Motor Show to introduce a new two-door concept car.

Rumored to be called the Monza, the Opel coupe will take aim at cars like the BMW 4-Series and Audi A5 thanks to a rear-wheel drive chassis borrowed from the Cadillac ATS. Given those ATS roots, the Monza will presumably be offered with a 2.0L turbocharged four-cylinder as well as a 3.6L V6. Diesel mills will also be on offer for the European market.

Inside the Monza will feature the latest in mobile technology, including Apple's Siri Eyes Free connectivity.

GM CEO Dan Akerson has previously stated that Buick will source future models from Opel, so it's possible we could see a Buick-badged version of the Monza in U.S. showrooms. The report from Auto Express also lines up with previous rumors that suggest Buick is readying as many as three models - including a new-age GNX - based on the ATS' platform. Those models could make an appearance at the 2014 Detroit Auto Show.

If given the green light, the Opel Monza - along with its Buick counterparts - could enter regular production as early as 2016.