Neil Redfearn tore into Luke Varney after Leeds United's loss to Blackburn, accusing him of diving to win the decisive penalty.
Substitute Varney went down inside the box late in the game, and referee Kevin Wright adjudged Sam Byram had fouled him.
Redfearn disagreed, telling Leeds United TV: "It's not a penalty. I don't like berating officials and referees because it's a difficult job, but it's such a poor decision and it affects the game.
"The decision should have been a free kick to us and a booking to Varney for simulation."
Varney, who had just nine touches when he came on in Rovers' 2-1 win, has previous.
It came while playing for Leeds, when his former boss at Blackpool, Ian Holloway rowed with him on the pitch and later in the press for what he perceived a dive against his Crystal Palace side two seasons ago.
He told ITV: "I thought I saw Luke Varney foul Johnnie Williams from behind, a blatant yellow card."
"Two minutes later Varney dived and got given a yellow card, and he should have been off
"Varney didn't have to dive, but in the first half he got fouled - but no free-kick. I don't condone that (diving) though."
Leeds drew that day at Selhurst Park 2-2; and the scorer of both of Palace's goals - Leeds forward Steve Morison.