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NEW YORK (AP) – The NBA has informed teams that jumping on a player’s back to commit an intentional foul could be ruled as a flagrant violation.

In a memo sent to teams Tuesday and posted on, the league calls the tactic a “potentially dangerous play against a player in a vulnerable position.”

Teams were told that referees have been instructed to evaluate whether one of those fouls, which have been used on poor free-throw shooters such as Dwight Howard and Andre Drummond, meet the criteria of a flagrant foul.

NBA Commissioner Adam Silver said Saturday there would be no new rules regarding Hack-a-Shaq this season but that a memo would be sent this week to teams clarifying the interpretation of that play.

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