Alonso was recently rumoured to be taking part in the 2018 Daytona 24 Hours in preparaton for an entry for Le Mans later in the year. He's just confirmed the Daytona race, below. This is in his efforts to win the triple crown after his faled attempt at Indianapolis this year, which he will not be attempting in 2018.
Alonso will race the United Autosports Ligier JS P217 alongside previously announced drivers Phil Hanson and Lando Norris.
http://www.mclaren.com/formula1/team/fe ... s-3174620/