Hull coach Lee Radford criticised referee Liam Moore after a sluggish 26-16 win over Wakefield.
The win moves the Airlie Birds level on points with Warrington in second place, though their inferior points difference keeps them third.
Speaking in his post-match press conference, Radford said: “I don’t want to cop a fine but I thought it was a really poorly-managed game.
“I thought the ruck speed was Championship One level. It’s something I’ve spoken to the official about previously. When it’s like that, it becomes a slow game.
“I don’t know whether supporters want to watch them or whether’s that a good advert for Super League. I’m a rugby league fan and I like to see the ball whistle.”
The limelight on referees has increased in recent weeks, most notably over the handling of the Catalans game against Warrington by James Child.
It has prompted referees chief Steve Ganson to come out with a statement detailing the action being taken against dissenters.