NEW YORK—NFL commissioner Roger Goodell has followed up his suspension of a Tampa Bay cornerback by re-emphasizing safety issues and warning that even first-time offenders will be subject to discipline.

He sent a memo Wednesday night, a day after the league announced the one-game suspension of Tampa Bay cornerback Elbert Mack for a helmet-to-helmet hit on Atlanta quarterback Matt Ryan last week. Mack, an undrafted rookie from Troy, had been fined $5,000 for unnecessary roughness against Houston quarterback Alex Brink during the Bucs’ exhibition finale Aug. 28.

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