"I will have a Supercross only contract in 2010 and I don't think you should race the Motocross des Nations if you haven't been riding Outdoors. I've made my decision and I will stick to that."

Stewart who had enjoyed his time at the Bercy Supercross will also race in Italy in a few weeks at the Genoa Supercross and then head to Australia for a Supercross race there. His main goal is to win the 2010 AMA Supercross Championship in 2010 and then possibly run both World Motocross Championship and AMA Supercross Championship.

"I would be open to race the World Motocross Championship," Stewart said. "It would be a good plan to race both AMA Supercross and FIM World Championship, although we have to look at that in the future, for 2010 it's just Supercross."