(AP Photo/Patrick Semansky)

ASHBURN, Va. (AP) Washington Redskins linebacker Reuben Foster appeared to injure his left knee during his first snap at an offseason practice Monday and was taken off the field on a cart.

Foster stepped on one of offensive lineman Tyler Catalina's feet, his left leg landed wrong and he went down in obvious pain. His left leg was stabilized before he was carted off, and while the team awaits an MRI and other tests, it didn't look good.

"We'll hope for the best right now until we get the results, but very concerning, for sure," coach Jay Gruden said after the first day of organized team activities. "I'll just have to wait and see before I get too emotional about it."

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