Bills rookie quarterback J.P. Losman hurt his left ankle during practice yesterday and had to be carted off the field.

Bills President Tom Donahoe didn't update Losman's condition, as the player was still having tests a half-hour after practice ended. The injury initially appeared serious, as Losman was unable to put any weight on his injured leg as he was helped into a cart and driven to the locker room.

Losman, the second of Buffalo's two first-round picks, was hurt two hours into practice when he was finishing a run up the right side during a two-minute drill. As he was pulling up, cornerback Troy Vincent laid a shoulder into Losman's upper body, knocking him over.

Calling the collision an accident, Bills Coach Mike Mularkey said, "Troy's not going to try to hurt anybody and J.P., he loosened up right there at the end -- you can't do that."

Selected 22nd overall from Tulane, Losman is being groomed as Drew Bledsoe's successor. In two preseason games, he went a combined 9 of 11 for 78 yards, and is second on the team in rushing with 80 yards on seven carries.

Starting left tackle Jonas Jennings also left practice after twisting his right ankle.

* JETS: Defensive end John Abraham will meet with NFL officials today about a possible second violation of the league's substance abuse policy.

Abraham already is tested under the policy because of a drunk-driving incident last year. He is not permitted to drink alcoholic beverages, but a recent test result showed a high alcohol content.

"John is currently addressing an issue with the NFL that is confidential," his agent, Tony Agnone, said. "However, we can say that this issue will not interfere with his ability to be an active member of the New York Jets this season."

Abraham, a two-time Pro Bowl selection, would be subject to a fine amounting to four game checks (about $340,000) if he violated the policy again. A third strike could result in a suspension of at least four games.

Last October, Abraham was arrested on charges of driving while intoxicated after crashing his car into a utility pole and fire hydrant. He pleaded guilty to driving while impaired, a reduced charge.

Coach Herman Edwards benched Abraham for a game against Buffalo.

But since, Edwards has called Abraham "a model citizen."

* VIKINGS: Cornerback Derek Ross, who tied for the NFL rookie lead in interceptions two years ago, signed with Minnesota.

New Orleans was the latest team to waive Ross, a third-round pick by Dallas in 2002. Ross started nine games that season and had five interceptions.

The Saints let the former Ohio State player go after he missed a plane and failed to report on time.

* PATRIOTS: Veteran fullback Fred McCrary was released.

Primarily a blocking back, the seven-year veteran joined New England before last season, starting three games before he was sidelined with a season-ending leg injury.

The team also placed rookie safety Guss Scott on injured reserve. Scott was a third-round pick from Florida.

* TEXANS: Defensive end Gary Walker will rest for a week to 10 days to allow his strained groin to heal.

Walker, Houston's two-time Pro Bowl lineman, tweaked the muscle during practice Monday and was helped off the field. General Manager Charley Casserly said Walker will be ready for the season opener.