Gregoire was set to return to the Indy 500 in 2007 for Chastain Motorsports, the team he drove for in 1997 and 1998. A crash in practice on May 17, ended his chances. Gregoire broke a bone in his back and would not be able to qualify for the 2007 "500." The Chastain team named Roberto Moreno their replacement driver and he successfully made the race.