IRVING -- Because of injuries to others, Dallas Cowboys running back Phillip Tanner has taken plenty of practice snaps this week with the first-team offense.
The second-year back considers himself ready, if needed, to make his first NFL start Sunday against the New York Giants. But the former free agent draws the line at declaring himself comfortable in that role. Or any role in professional football.
"I'm never comfortable. That's what kills you, when a guy gets comfortable and complacent," said Tanner, who had a career-high 13 carries in last week's 19-14 victory over Carolina in relief of injured teammates DeMarco Murray (foot) and Felix Jones (knee). "I still come in every day as if I'm a free agent trying to make this team. I study film as if I've never seen it before. I take notes as if I've never read it before. Just so I can stay on my toes and won't become complacent ...So if I was good at 13 carries, I'll try to be better at 14. And on and on and on."
That work ethic, coach Jason Garrett said, offers comfort to the Cowboys if Tanner -- a third-teamer with 44 career carries for 137 yards -- handles most of the workload Sunday against the Giants with Murray out and Jones on the mend. Jones practiced Thursday on a limited basis and, barring a setback, is expected to start Sunday.
But if Jones cannot play or cannot finish Sunday's game, the spotlight shifts to Tanner. And Tanner's primary backup would be rookie Lance Dunbar, a free-agent signee from North Texas and Haltom High School whose lone NFL carry covered 11 yards in the team's 31-29 loss at Baltimore on Oct. 14.
Dunbar said the undrafted duo can handle a showdown with the reigning world champions, if necessary.
"I'm pretty confident in myself and I'm confident in him," Dunbar said. "If that happens, we'll approach it like, 'OK, we can do this. It's just another game.' We'd play our game and let it happen."
And their games differ greatly.
Tanner (5-foot-10, 217 pounds) offers a blend of power and speed that teammate Tyrone Crawford likened to Doug Martin, Tampa Bay's first-round pick in the 2012 NFL Draft. Crawford, a defensive tackle, played at Boise State with Martin and said Tanner "reminds me of Doug [because] they both run low, powerful and with good vision. He's a smashmouth back with speed and it's good to have him."
Dunbar (5-foot-8, 191 pounds) is more of a breakaway threat who is dangerous in the open field.
"His quickness is sick," fullback Lawrence Vickers said. "He's great with the ball."
Regardless of who plays running back against the Giants, the Cowboys seek to match the ground-and-pound production they had in a 24-17 victory over the Giants on Sept. 5 (143 rushing yards, including 131 by Murray) and in their past two games. Dallas rushed for a season-high 227 yards against Baltimore and collected 85 against Carolina while controlling the clock for 33:37.
Against the Panthers, Tanner (13 carries, 30 yards) handled the ball seven times in the final 7:32 on drives that resulted in a go-ahead field goal with 3:28 remaining and another to pad the lead with 58 seconds to play. Tanner touched the ball nine times in the fourth quarter (eight carries, one catch), including a 5-yard trap play on third-and-9 that preceded the go-ahead field goal.
"He's on our team for a reason," Garrett said, praising Tanner's ability to handle a bigger role in an emergency situation. "At every turn [since signing with Dallas], he came in here and said, 'You are not cutting me from this football team.' When he's gotten more opportunities in the preseason or the regular season, he's shown us he can do a good job for us."
Tanner's biggest opportunity could come Sunday if Jones' knee ailment elevates Tanner into the starting lineup. It would be a moment the Dallas native, who played at Kimball High School, has envisioned since signing with his hometown NFL team on July 28, 2011.
"The most important thing I've learned is always be mentally prepared. Just take it to practice every day as if I'm going to be the starting running back," Tanner said. "That's been my mind-set since the first day. Just to work hard and jell with the offensive line as if I'm the starting running back. So that when my time came, I would be ready."
Vickers said the Cowboys' ground game can be productive Sunday even if it leans on a Tanner-Dunbar tandem against the Super Bowl champs.
"Absolutely," Vickers said. "Every back in that backfield is ready to go at all times. We're preparing to make sure we can be a dominant group and hold up our end on the football field."
Jimmy Burch, 817-390-7760