Alfa Romeo's next roadster won't be based on the Mazda MX-5 Miata through a partnership between the two automakers, as was previously announced.

This, according to CAR magazine, which spoke with sources close to Alfa Romeo's top decision-makers, although there may yet be life for the partnership in the development of future products. The agreement originally granted FCA access to the 2016 Miata's chassis, with a collaborative development process anticipated.

Instead, based on CAR's report, the roadster will now be developed in-house by Fiat's Abarth tuning arm. The collaborative product is still to come.

Alfa Romeo recently returned to the United States and currently sells one product here, the 4C sport coupe. Additional models are planned for the lineup in the U.S., but—for now—the lineup will not include a Japanese-engineered roadster.

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