DALLAS (AP) _ A fantasy football-themed event in Las Vegas headlined by Tony Romo was called off after the NFL reiterated a policy banning appearances associated with casinos.

A league spokesman said Saturday the NFL “reminded the players association” of the policy with the National Fantasy Football Convention event scheduled for next month.

Romo, who recently joined Twitter, wrote that the league canceled the event and said he was “sad for the fans and players.”

In a statement on the event’s website, organizers said the cancellation was “a direct result of sudden and unexpected opposition taken by the NFL.” They said they were rescheduling for next summer in Los Angeles.

Several NFL stars were expected to attend, with autograph sessions and other fantasy-related events planned.