IndyCar and Indianapolis Motor Speedway's owners say some of the recommendations in a leaked report from Boston Consulting Group could come to fruition, but that it should not be taken as a firm blueprint for the future.
The Associated Press reported that it had obtained what Indy parent firm Hulman & Co CEO Mark Miles described as an "early version" of a 115-page report on improving the positioning of the IndyCar Series.
Suggestions reportedly included a condensed 15-race calendar held across 19 weeks, including a three-race playoff series, followed by a non-championship international series in the off-season.
It also mooted an overhaul of the Leaders' Circle subsidies in favour of a performance-based system, and consolidating the television package into one network. Broadcast rights in the US are currently split between NBC Sports Network and ABC/ESPN.
The report also recommended that both IndyCar and IMS remain under Hulman & Co's ownership.
Miles said in a statement that the report is just part of a broader study into the future direction of Hulman & Co's motorsport assets.
"The work BCG has done provides conversation points around several important areas of our business as we shape our thinking about the future, but our strategy has not yet been finalised," he said.
"As part of finalising our strategy, we will be sharing information with our stakeholders and listening to their feedback and ideas before we come to any final conclusions.
"We are in the early stages of this process and will be communicating to our stakeholders and fans as we define our strategy for the future."