WEST POINT, N.Y. -- Army star quarterback Bryson Daily will miss Saturday's game against Air Force with an undisclosed injury/illness, Army officials told ESPN.

With Daily sidelined, junior Dewayne Coleman will fill in at quarterback and make his first career start.

There is no timetable at this point on how long Daily might be out of the lineup, but Army officials don't think it's a season-ending setback.

Daily, one of four team captains, has been Army's starting quarterback over the past two seasons and the main cog in a Black Knights offense that has eclipsed 400 yards of total offense in all seven games this season.

He leads the nation with 19 rushing touchdowns and leads all FBS quarterbacks with 909 rushing yards. He was unable to practice this week.

The No. 21 Black Knights had a bye last weekend after beating East Carolina 45-28 on Oct. 19 to win their seventh straight game this season.

In the win over East Carolina, Daily carried the ball 31 times for a career-high 171 yards and accounted for six touchdowns (five rushing, one passing). The 6-foot, 221-pound senior has already set Army single-season records for touchdowns responsible for (26) and rushing touchdowns in seven games.

Army, off to its best start in nearly 30 years, will be one of the top contenders for the Group of 5's spot in the College Football Playoff if the Black Knights can win the American Athletic Conference championship. Army (7-0, 6-0) travels to North Texas next week for an AAC contest. The Black Knights get a bye week on Nov. 16 and then face Notre Dame on Nov. 23 at Yankee Stadium.