The 35-year-old Italian has not yet signed a contract for next year and last week admitted it was very unlikely that he will remain with Toyota, although he has been linked with the new Lotus F1 team.
Following the F1 season finale at Abu Dhabi on November 1, Trulli wil have a seat fitting with MWR and will join the team to observe the last three races of the year. He is scheduled to test at the International Speedway in Lakeland in the week before the Cup finale at Homestead Miami.
Steve Hallam, former chief engineer at McLaren, is now the director of competition at MWR and is eager to test drivers with F1 experience in NASCAR.
"As you well know, this is not an easy sport," Hallam told American network Fox Sports. "But from time to time an opportunity arises for both them [open-wheel racers] and us to take a look.
"It's very premature to get carried away with this because it takes a long time for both parties to know where they are in terms of performance."
Trulli will join former grand prix driver Mika Salo in testing for MWR at the end of this season.
Trulli says NASCAR test ‘just for fun’Pennant expecting success
