Matt Lehr, who started at center for the Cowboys last season, has moved to a reserve guard role. Al Johnson, Gennaro DiNapoli and Tyson Walter are rotating at center.
The Cowboys are looking at a lot of different line combinations. Larry Allen is back now and still might occupy a spot. Kurt Vollers, who finished the season as the starter at right tackle after replacing Ryan Young, is backing up Flozell Adams at left tackle. Rookie second-round pick Jacob Rogers, Torrin Tucker and Javiar Collins are competing at right tackle.