- Calvin Watkins, ESPN Staff Writer
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IRVING -- So, how many defensive linemen do the Cowboys need?
The team signed defensive tackle Rob Callaway to the practice squad Thursday after working him out.
Callaway, who played college football at Saginaw Valley State, spent his rookie season on the Detroit Lions practice squad last year.
NFL teams can have only eight players on their practice squad. The Cowboys have Mario Butler, Shaun Chapas, Isaiah Greenhouse, Andre Holmes, Orie Lemon, Akwasi Owusu-Ansah, Teddy Williams and Callaway.