CHAPEL HILL, N.C. — Less than a year after emerging from a long run of NCAA issues, North Carolina is dealing with rule violations again — this time for football players selling team-issued shoes.

The school announced Monday that 13 players will miss games serving suspensions for the secondary NCAA violations, which will leave the Tar Heels shorthanded during much of the season’s opening month. While secondary violations are generally considered less severe, the penalties in this case will result in several players being forced to sit out at least a third of the regular-season schedule.

In all, nine players will miss four games, two will sit two games and two others will miss one contest.