The American single seater series currently has two engine suppliers: Honda and Chevrolet.
Cosworth has an IndyCar motor ready to go, and according to its owner, the motor could be on the grid in 2015.
"Yes, we are in serious discussions with a number of companies – two in particular – and it doesn't take a huge imagination to think about who might be bringing a new car into the U.S. for the first time in a long time," Cosworth owner Kevin Kalkhoven told Racer magazine, possibly alluding to Alfa Romeo.
"Specifically, the project with one manufacturer is going to final recommendation sometime in the next month. That decision's going to be binary: Yes they will, or no they won't."
However, the magazine points out that one potential stumbling block are aero kits.
In fact, the IndyCar series will introduce the manufacturer-specific body kits next year, and both of the series' current engine manufacturers are at advanced stages with their designs.
For any new manufacturer to become competitive, such as Cosworth, commissioning an engine would only be half of what's needed to be produced by 2015.
For a new manufacturer to be competitive not only requires an engine, but also a body kit, which requires a lot of work, time, and money.