According to reports from Speed TV rival US sportscar series the American Le Mans Series (ALMS) and the Grand-Am run Rolex Series could be on the brink of merging, perhaps as soon as the 2014 season.

In recent years both series have struggled for entry numbers, especially in their premier prototype classes, outside of their respective headline events.

This weekend’s ALMS race in Baltimore includes just six cars split equally between the two LMP classes while the most recent Rolex Series race at the Circuit Gilles Villeneuve in Montreal was headed by just eight of the third generation Daytona Prototypes introduced at the start of 2012.

Few details of the merger are known, including how it would affect the classes of the two series which are largely incompatible with each other, the only similarity on face value coming between the ALMS’s GTC category and the GT class of the Rolex Series, which largely run to a lower spec than the GTE based equivalent in the ALMS.

Any agreement could – potentially – bring together three of North America’s great endurance races with the Rolex Series currently competing in the Daytona 24 Hours while the ALMS races in both the 12 Hours of Sebring and Petit Le Mans.

Speedtv.com report that an announcement could be as imminent as later this week from Grand-Am’s Daytona base.