Indianapolis ? Michael Andretti has watched as many of CART’s high-profile owners have left for the rival Indy Racing League. Andretti isn’t ready to leave for the IRL and provide another blow to CART, but he is facing that possibility.

Andretti, the winningest driver in CART history, is buying his own racing team but says his sponsorship will decide which of the rival open-wheel series he will compete in next year.

Team Green owner Barry Green said Tuesday he was selling the team to his brother and Andretti.

Andretti will be the team’s majority owner and chief executive, with Barry Green remaining as a consultant and minority partner. The new team will be known as Andretti Green Racing.