Rocketsports Racing are to test Alexandre Negrao later this week as they continue the evaluation of drivers for a seat with them for 2008.
The Brazilian, who has raced in GP2 for the last two seasons, will run for the team at Houston tomorrow and Thursday.
Speaking about his test, Negrao said: "This is a wonderful opportunity for me. I would like to thank Paul Gentilozzi and the Rocketsports Racing team for inviting me to come out and test their Champ Car. I look forward to getting behind the wheel and seeing what I can do.
"My passion is driving fast cars, and this gives me a great chance to try out a new race car. This will definitely enhance my overall experience as a driver and possibly open up opportunities for the future."