Montoya won the Indy 500 in 2000 as a rookie, and repeated the feat 15 years on with Team Penske.
Should he add a third Borg-Warner Trophy to his CV, it would make him the fifth-oldest winner of the famous race, two years younger than the overall record holder, Al Unser who was victorious at age 47 in 1982.
“I’m delighted for Juan to rejoin the McLaren family and return to the Indianapolis 500 with Arrow McLaren SP,” said CEO of McLaren Racing Zak Brown.
“He is an intensely competitive, highly versatile driver, with deep experience at the top level of motorsport and a big following. Having him with us at the 500 next year will be great for the team and IndyCar fans everywhere.”