The Dallas Cowboys want receiver Terry Glenn on their team.But an NFL source said the Cowboys have told Glenn to either sign the $500,000 injury waiver for his surgically-repaired right knee or prepare to play elsewhere. And that time is growing short for Glenns decision.Glenn is due $1.74 million this season. By signing an injury waiver, if he injures his right knee at any time, that $1.74 million would be nullified and he would be paid a pro-rated $500,000. If he was to suffer any other injury other than to his right knee, he would be paid the full $1.7 million.Glenn is coming off two surgeries last season that limited him to appearing in the regular-season finale at Washington and the divisional playoff game against the New York Giants. He did not catch a pass against the Redskins. He had two receptions for 30 yards against the Giants.The Cowboys are not allowing him to participate in their organized team activities or any other practice until he signs the waiver.