[Kansas City.com] The clock started Wednesday on the three-week trial period for linebacker Shawn Barber. He practiced for the first time, and the Chiefs now have three weeks to decide whether to activate him.

If they decide against it, Barber’s season is over.

Barber, a former starting linebacker, injured his knee almost a year ago to the day in the Chiefs’ loss to Tampa Bay. He hasn’t practiced or played since.