During the first month of the season, Dallas Cowboys end Jason Hatcher emerged as the team's most productive defensive lineman.
After Cowboys defensive coordinator Rob Ryan promoted him to a starting role at the beginning of the season, he collected eight tackles and two sacks before suffering a strained left calf in the first quarter of the Cowboys' victory over the Redskins last Monday.
Marcus Spears, a seven-year veteran who has started 78 games in his career, is expected to replace Hatcher, who will not play Sunday against the Detroit Lions.
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