Dallas Cowboys middle linebacker Sean Lee injured his left hamstring badly enough in a 49-17 loss that he'll have a magnetic resonance imaging exam today.

He got hurt in the second quarter nad didn't return.

"I don't know the severity, but obviously it's not good," Lee told Dallas reporters. "So, we got to figure it out and do whatever I can to rehab and get back as fast as possible."

Following the injury, Justin Durant replaced Lee and then hurt his hamsting.

Lee is the Cowboys' leading tackler with 90 stops.

Follow me on Twitter: @RavensInsider

Aaron Wilson covers the Ravens for The Baltimore Sun.