Ford Motor Co. will announce investments in three of its Michigan manufacturing plants Tuesday morning, according to three sources familiar with the automaker’s plans.

The Dearborn-based automaker will announce investments at its Michigan Assembly Plant in Wayne, Flat Rock Assembly Plant and its Romeo Engine Plant, according to the sources who agreed to speak only on the condition of anonymity because they were not authorized to release the information. It is unclear how many jobs will be created, or the total dollar amount. However, one of the sources characterized the investments as “significant.” A promised $700 million investment at the Michigan Assembly Plant was part of the 2015 Ford-United Auto Workers contract.

The automaker plans to invest $9 billion in U.S. facilities through 2019, resulting in 8,500 new or retained jobs, according to the 2015 contract. Besides the $700 million investment at Michigan Assembly for new products — the 2019 Ford Ranger pickup and the all-new Ford Bronco planned for production by 2020 — the contract outlines a $400 million investment planned for Flat Rock for Ford Mustang and Lincoln Continental production, and a $150 million investment at the Romeo Engine plant for engine updates. It is unclear whether Tuesday’s announcements go beyond those plans.