"Stewart's plans for upcoming Sprint Cup races have yet to be determined," the team said.
Stewart, 43, has been in isolation since the Aug. 9 incident in which he struck and killed another driver, 20-year-old Kevin Ward Jr., while Ward was on foot during a sprint-car race at a half-mile dirt track in upstate New York.
While Stewart and Ward raced side by side, Ward's car crashed into the outside fence. Ward then climbed from his car, walked on the track and apparently was angrily gesturing at Stewart when he was run over as Stewart came back around.
No charges are pending against Stewart but the Ontario County, N.Y., sheriff's office is still investigating.
The story of the incident, accompanied by a graphic amateur video, went viral on the Internet and has sparked a nationwide public debate about who might have been at fault.
Funeral services for Ward were held last Thursday in Turin, N.Y.