By Chris Emma-

(CBS) The first practice of a game week turned ugly for the Bears.

With the inside track for the third receiver spot, Marquess Wilson fractured his right clavicle at Monday’s practice, the team announced. The Bears gave no timetable for Wilson’s return.

“I’m extremely disappointed,” Bears coach Marc Trestman said. “He was continuing to ascend. That’s football, unfortunately. We’ll pray for his recovery as soon as he can get things done that he needs to get done.”

Wilson was injured while diving for a pass in the left corner of the end zone. He was helped back to the huddle and examined by team doctors, then was later carted off while clearly favoring his right arm.

In 2010, Cowboys quarterback Tony Romo suffered a fractured clavicle in late October and missed the remainder of the season. Still, whether it’s a displaced or non-displaced injury has a lot to do with the timeframe for recovery, and the extent of Wilson’s injury wasn’t immediately known.

Eric Weems, Josh Morgan and Josh Bellamy are the other receivers listed among Chicago’s top six on the team’s unofficial depth chart, but Trestman wouldn’t get into specifics yet as to who could be Wilson’s replacement.

“Let’s let things simmer for a day and respect the situation that happened,” Trestman said.

In other participation news, starting weak-side linebacker Lance Briggs also got banged up, bruising his knee and not finishing practice, and defensive end Jared Allen was excused from practice for personal reasons.

On top of all that, practice ended early when tight end Martellus Bennett initiated an ugly skirmish with cornerback Kyle Fuller after the latter got his hands inside Bennett’s shoulder pads on a tackle attempt.

The Bears open their preseason slate Friday at home against the Eagles.

 Follow Chris on Twitter @CEmma670.

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