Dallas Cowboys' Anthony Spencer not confident of facing New York Giants

Dallas Cowboys defensive end Anthony Spencer has revealed that he is doubtful for his side's season opener on Sunday.

The 29-year-old suffered a setback in his recovery from knee surgery during practice this week and is not confident about facing the New York Giants this weekend.

"I mean there is a possibility," Spencer told Dallas Morning News.

"But I really haven't done too much this week so I don't feel very confident. We'll see."

Spencer had a career year in the 2012 season as he registered 11 sacks, the highest total accumulated in his six years in the NFL.