The NFL will continue to prohibit players from dunking over the crossbar after touchdowns, a source confirmed Wednesday, even after it relaxed its celebration policy.

Although the NFL has relaxed its rules against celebrating touchdowns, dunking the ball over the goalpost, like the Packers' Davante Adams did against the Lions last season, will still not be permitted. AP Photo/Duane Burleson

The league has declined this week to address questions about specific celebrations, noting that officials will have some discretion to decide whether they are spontaneous or unsportsmanlike. But in a letter released Tuesday, commissioner Roger Goodell wrote that it would still be against the rules for celebrations to "delay the game."

Dunking falls under that category because of the possibility that the goalpost could be dislodged and require repairs. It also violates a rule that remains in place: using the goal post as a prop. That's largely why it was banned in 2014, after being popularized by tight ends Tony Gonzalez and Jimmy Graham, among others.

A player who dunks after a touchdown, or tries to, will be subject to a 15-yard penalty and a possible fine.

But there will be many more acceptable options to choose from after the NFL approved three general categories of celebrations: using the ball as a prop; going to the ground; and group celebrations.

Twerking also is still expected to be penalized, as Pittsburgh Steelers receiver Antonio Brown was after a touchdown in September. Similarly, violent imagery, including throat-slashes and any representation of weapons, such as shooting a bow and arrow or a machine gun, figure to be subject to penalty.

Cincinnati Bengals coach Marvin Lewis voiced his opposition Tuesday to the NFL's relaxing its celebration rules, saying it won't set a good example for the league's younger fans. Asked about Lewis' comments Tuesday at the NFL's spring meetings, Goodell disagreed.

"I've heard it from Marvin before. We have had these discussions over the last couple of years. I think the players will prove him wrong on that," Goodell said.