Rams DT Ryan suffering from post-concussion symptoms

St. Louis Rams defensive tackle Clifton Ryan didn't travel with the team because he's suffering from post-concussion symptoms, a league source said Sunday.

Ryan was downgraded from questionable to out on the Rams' injury report, and he didn't make the trip to Oakland on Saturday. The Rams play the Raiders on Sunday.

Ryan was hospitalized overnight Wednesday with migraines, according to The St. Louis Post-Dispatch, then missed practice Thursday. He stretched with the team Friday, but he didn't participate in drills.

The Associated Press contributed to this report.

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