CHAPEL HILL — North Carolina will be lacking significant firepower on offense with the opt-out departures of three stars who have entered the NFL Draft, but play-caller Phil Longo won’t be asking quarterback Sam Howell to counterbalance those losses by taking on added responsibilities in the Orange Bowl.

As the 14th-ranked Tar Heels (8-3) have gone about regrouping for Saturday night’s assignment against No. 5 Texas A&M (8-1) in Miami Gardens, Fla., Longo, the offensive coordinator, has instructed Howell that, despite the considerable absences, North Carolina doesn’t need him striving to summon something extra.