The NFL is investigating whether text messages were sent to the Cleveland Browns' sideline during games.

Texting would be a violation of the NFL's rules prohibiting electronic communication during games.

Signora did not elaborate except to say the league is looking into the matter.

"We are reviewing internally and will fully cooperate with the NFL on this matter," the Browns said in a statement.

Cleveland.com originally reported the text messages were sent and said it was one issue in former offensive coordinator Kyle Shanahan leaving the team. He perceived it as interference from the front office regarding coaching decisions.