Fans won’t see the Nets’ Jarrett Allen in his “ninja-style headwear,” or any other player for that matter. The NBA has banned players from wearing increasingly popular headbands this season.

A number of high-profile players — including Allen, Miami’s Jimmy Butler, Minnesota’s Karl-Anthony Towns, New Orleans’ Jrue Holiday and the Clippers’ Montrezl Harrell, among others — had regularly worn ninja-style headgear. But they never had the look formally approved by the league, which delayed taking a stance on it. The handband is tied in the back and usually has a tail that runs along the player’s neck.

Apparently the league’s stance is a no, according to ESPN. The NBA told teams in May that the headbands wouldn’t be part of the approved uniforms for this upcoming season.

“The ninja-style headwear is not part of the NBA uniform and hasn’t been through the league approval process,” NBA chief communications officer Michael Bass told ESPN. “Teams have raised concerns regarding safety and consistency of size, length and how they are tied which requires a thorough review before consideration of any rule change.

“When some players began wearing them last season, we didn’t want to cause a disruption by intervening midseason, but we notified our teams in May that they would not be part of this season’s uniforms.”

Bass told ESPN that the league’s competition committee planned to discuss the headwear during its meetings in Chicago.