Keith Brooking strains hamstring

SAN ANTONIO -- Linebacker Keith Brooking flung his helmet to the ground in frustration moments after making an interception that he might have returned for a touchdown.

That's because Brooking strained his hamstring en route to the Alamodome end zone. The Cowboys won't know the severity of the injury until Brooking is further evaluated Saturday.

Brooking, a 14-year veteran, has proven to be one of the most durable players in the NFL. He hasn't missed a game since suffering a knee injury in his second season, a span of more than a decade.

Second-year linebacker Sean Lee will get more work with the first-team defense during Brooking's absence.