The executive director of the NFL Referees Association is the latest to release a statement to rubbish the continued conspiracy theory about bias towards the Kansas City Chiefs.

Roger Goodell called it a “ridiculous theory” and three-time Super Bowl winner Julian Edelman labelled it as “baloney” and now the head of the refereeing union has also rejected the claims.

“It is insulting and preposterous to hear conspiracy theories that somehow 17 officiating crews consisting of 138 officials are colluding to assist one team,” Green said in a statement.

“NFL officials are graded every week, on every single play of each game. These grades are the determining factor as to who receives post-season assignments.

“There are many things that fans can worry about over a 17-game season, such as coaching decisions, player injuries, the weather and, yes, even close calls on incredible plays made by incredible athletes.

“But you can rest assured that on every single down, NFL officials, both on the field and in the replay booth, are doing everything humanly possible to officiate every play correctly.”