Cowboys veteran wide receiver Terry Glenn is not sure he's ready to get back on the field. Glenn said he hopes his right knee allows him to get back on the field soon, but sounded uncertain if he will play in the opener Sept. 9 against the New York Giants. Glenn had arthroscopic knee surgery Aug. 1 to remove loose cartilage. "There's always a question," said the 33-year-old Glenn, after the team's kickoff luncheon at the Hotel Intercontinental. "With the grace of God, hopefully I will be out there."