Leeds United boss Steve Evans was left fuming by referee Anthony Taylor following his side's 2-0 defeat to Sheffield Wednesday at Hillsborough.
The Owls took the victory thanks to two second half goals from Gary Hooper but it was the man in the middle who provoked Evans' ire after a Liam Cooper goal was disallowed in the 78th minute.
Wednesday were making a substitution, but with Fernando Forestieri still leaving the pitch, referee Taylor allowed Alex Mowatt to take a free kick which Cooper turned in.
However, amid protestations from the home side and after consulting with his officials, Taylor disallowed the 'goal'.
"I've been into see Anthony and he said by law he's got it right because it should be disallowed," said Evans. "I've seen many times where the referee stops it for a substitution, someone's taking for too long and he restarts play, but I've never seen somebody going back to restart play again, ever.
"He's a Premier League referee who's stepped down to take a big derby - he should be with the under-nines on the park pitches on Monday.
"You cannot make a mistake of that magnitude in a game which means so much to both sets of supporters."
Sheffield Wednesday head coach Carlos Carvalhal, unsurprisingly held a different view.
"To me it's very clear. The fourth referee showed a strong personality," Carvalhal added.
"My view is very clear that he must cancel that goal because the game has stopped at that moment to do the substitution."