Toyota has ruled out its World Endurance Championship drivers - including Fernando Alonso - being available to contest the IMSA SportsCar Championship's Sebring 12 Hours.
Alonso and Toyota LMP1 team-mates Kamui Kobayashi and Mike Conway are all competing for Cadillac teams in the IMSA-opening Daytona 24 Hours, with Wayne Taylor Racing running Alonso and Kobayashi while Conway drives for Action Express.
The WEC's 1000 miles of Sebring is being held on Friday March 15, following practice and qualifying across March 13-14.
IMSA's legendary Sebring race is on the same bill, with practice and qualifying across March 13-15 and the 12 Hours on March 16.
While some high-profile names are expected to pull double duty at Sebring, such as IMSA Mazda drivers Olivier Pla and Harry Tincknell racing Ford GTs in the WEC, Toyota has confirmed that Alonso, Kobayashi and Conway will not be among them regardless of what happens at Daytona.
"I can confirm that all our drivers will be focused exclusively on WEC at Sebring as per their contracts," a Toyota spokesman told Autosport.
This leaves Wayne Taylor Racing and Action Express Racing seeking third drivers for the Sebring 12 Hours.
WTR replaced IndyCar ace Ryan Hunter-Reay with Alonso and Kobayashi for Daytona this year, but team and driver reportedly remain on good terms and the Sebring 12 Hours falls in the weekend between IndyCar's first and second rounds.
At Action Express, Christian Fittipaldi was scheduled to retire from driving after Daytona but the three-time 24 Hours winner and 2015 Sebring victor could be persuaded to postpone his retirement by one race.