Seattle Seahawks rookie defensive lineman Cassius Marsh injured his knee after a collision in the final practice of training camp on Wednesday, according to multiple reports.

Gregg Bell of the The News Tribune recapped the injury:

Marsh got tangled with Lemuel Jeanpierre, who was playing guard today, and defensive lineman D’Anthony Smith at the end of the final play of a running-game portion of the helmets-and-no-shoulder-pads practice. All three went down in a heap, with Marsh staying down. After a minute of sitting up he went onto his back with his gloved hands over the top of his helmet in apparent frustration. Marsh then got up and walked off the field under his own power into the locker room. He did not return to the field for any of the final hour or so of practice.

Marsh left the field about halfway through the nearly two-hour practice and returned wearing street clothes. He will have an MRI to determine the severity of the injury, according to reports.

The fourth-round pick out of UCLA has been one of the most impressive rookies in training camp, and racked up a sack and tackle for loss in the Hawks’ preseason opener last week at Denver.

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