The Risi Competizione Ferrari team will not contest the full IMSA WeatherTech SportsCar Championship in 2018.
The Houston-based squad, Ferrari's long-time representative in North American sportscar racing, has entered the season-opening Daytona 24 Hours later this month and has yet to confirm its plans for the remainder of the season.
Sources indicate that it will focus on the long-distance races that make up the Tequila Patron North American Endurance Cup.
A spokeswoman for Risi told Motorsport.com: "We are discussing doing more races, but nothing is set in stone at the moment.
"We are going to do Daytona and will take it from there."
Risi's GT Le Mans class Ferrari 488 GTE will be raced at Daytona on January 27-28 by factory drivers Toni Vilander, James Calado and Alessandro Pier Guidi.
It is expected that Risi will then be at round two of the IMSA series, the Sebring 12 Hours in March, with the same trio of drivers.
The status of ex-Formula 1 driver Giancarlo Fisichella, who has raced for Risi for the past four seasons, within the Ferrari GT set-up remains unclear for the moment.
Risi will also field a GT Daytona class Ferrari 488 GT3 in the IMSA opener.
Factory driver Miguel Molina will join Mexicans Martin Fuentes, Ricardo Perez de Lara and Santiago Creel in the car.
Risi, which won American Le Mans Series GT2 titles in 2006 and 2007, has been a regular in the IMSA series since its creation after Grand-Am's take-over of the ALMS for the 2014 season.
It was due to contest the full season last year with Vilander and Fisichella, but missed four mid-season races in the wake of a major crash at the Le Mans 24 Hours and two previous shunts in earlier in the IMSA series.
Norris aims to prove himself to Alonso at Daytona
3GT Racing confirms Kyle Marcelli for 2018 IMSA series