The calendar for the 2014 FIA World Endurance Championship appears likely to face at least one date change, following the release of Formula One’s provisional calendar last week.

The date in question is the Six Hours of Fuji, provisionally scheduled for Oct. 12, the same day as the F1 Japanese Grand Prix at Suzuka. F1’s trip to Japan was originally penned for the week prior but was changed at the last minute by the FIA.

The WEC confirmed its provisional schedule, which has yet to be ratified by the World Motor Sport Council, “may be subject to modification. However the venues and the order of the races announced [at Circuit of The Americas] will remain unchanged.”

It’s believed the Fuji round could move to either the week before or after its currently scheduled date. However, that could result in significant implications, as the Tudor United SportsCar Championship season-ending Petit Le Mans is scheduled for Oct. 4.

The 1,000-mile/10-hour Road Atlanta enduro, which will close out the American Le Mans Series, clashes with the Fuji round this year, with both series having worked together to avoid any conflicts in 2014.

Confirmation of a likely date change is expected to come at the next WMSC meeting.