Some reports say Henry tested positive for marijuana use. If it is true, then he could face a one-year ban from the NFL.
The reports come from information obtained from court papers filed in Brooklyn, New York federal court.
On September 20, Henry tried to get a restraining order to block the NFL from using a urine specimen against him and stop the league from revealing the test results.
Court papers filed by the NFL show that Henry may have failed the test.
Henry's restraining order was granted, but the league got an appellate court to overturn that order.
Henry claims the NFL violated substance abuse policy by not allowing his experts to be present for testing of his specimen.
quot;Obviously this is a very touchy situation, I can't go into as much detail as I would like to,quot; said Broncos Head Coach Mike Shanahan on Friday.
Henry, 28, was signed by the Broncos in March in a $22.5 million deal after he playing for the Tennessee Titans and Buffalo Bills.The contract also includes a $12 million guarantee.
Henry violated the league's substance abuse policy back in September 2005.
Knowing the history of drug abuse, University of Denver Marketing professor John Burnett says signing him was a risky choice.
quot;If you sat down and calculated the risk closely it probably was too high of a risk to take,quot; said Burnett. quot;If the Broncos were 4-0 this probably wouldn#39;t even be an issue.quot;
A league spokesman said the NFL had no comment.
Henry, who injured his right knee and right ankle in a loss at Indianapolis on Sunday, has not practiced this week nor has he been available to reporters. His agent, Hadley Engelhard, didn't return messages left by the Associated Press, nor did Henry's lawyer, Robert Dapelo.
Henry, who started his career with the Buffalo Bills, is the centerpiece of Denver's revamped offense.
The Broncos had hoped he could be their first workhorse running back since Clinton Portis in 2003, and he got off to a fantastic start, rushing for 433 yards and one touchdown over the first month. He also caught five passes for 52 yards.
Henry's backup is undrafted rookie Selvin Young out of Texas, who has rushed 15 times for 138 yards and a league-best 9.2-yard average. The Broncos might move second-year pro Mike Bell back to tailback if Henry isn't available. Bell was moved to fullback last month.
