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Jason Witten is going to have to get used to not doing much of anything if he wants to play in the season opener next month.

Dallas Cowboys coach Jason Garrett said Wednesday that the tight end suffered a "slightly lacerated" spleen in the preseason opener Monday against Oakland. The best way for Witten to heal is to remain as inactive as possible.

"It's a very serious injury, and we're really taking this thing day by day," Garrett said. "He has to be very still and idle for the next week to 10 days, so you won't see him out here on the practice field. He won't play in the game this week or next week. We've just got to make sure he heals as well as possible, as quickly as possible."

The coach said doctors will reassess Witten next week "after we've had a few days of him not doing anything." Surgery would be an option if the spleen isn't healing properly.

Steelers' Harrison has minor knee surgery

Pittsburgh Steelers linebacker James Harrison underwent left knee surgery on Wednesday, clouding his chances of returning in time for the start of the season.

Coach Mike Tomlin called the procedure "minor" but wouldn't put a timetable on when Harrison will be ready. The four-time Pro Bowler will remain on the physically unable to perform list.

Broncos' Williams found guilty of impaired driving

Jurors convicted Denver linebacker D.J. Williams of driving while ability-impaired and driving without headlights.

Williams was charged with driving under the influence and traffic charges, but the jury returned the lesser verdicts.

Williams was arrested Nov. 12, 2010, after police stopped him for driving without headlights and cited him for DUI.