Tony Docherty admitted he was baffled by the award of a pivotal penalty against Dundee as they lost 3-2 to Hearts at Dens Park.
The home side had opened the scoring in the first half through Jordan McGhee before the Jam Tarts equalised after the break with an Alan Forrest goal.
The Dark Blues took the lead once more with a stunning strike from Lyall Cameron before Hearts were awarded a penalty.
Referee Graham Grainger ruled that Lee Ashcroft had handled a Lawrence Shankland shot with the striker converting the spot-kick before scoring what proved to be a late winner.
However, Dundee boss Docherty questioned the penalty decision and why the official did not have another look at the incident on the pitchside monitor.
Docherty said: “I would love to come in after a game and talk about my team and how good they’ve been.
“But it seems to be the last five weeks all you do is talk about decisions.
“I just spoke to big Ash there, who is the most honest boy you could meet. What are you meant to do there?
“Are you meant to cut off a body part? What are you meant to do when you are a yard away from the player and it hits you.
“It was such a pivotal point in the game. We had gone from 1-1 to score a wonderful goal to go 2-1 up and I thought we were comfortable.
“Hearts are a really good side with a top striker in Lawrence Shankland. I thought we were handling it well but it was just that moment in the game that changed everything.
“Why doesn’t he go and check it? I don’t understand. He’s told me: ‘Had I seen it again…’ Why did you not go and see it again?
“We have invested as an industry and a football club in a piece of apparatus there that you can go and check.
“Yet you don’t do that. It is just galling for me.”
Shankland had been the subject of intense transfer speculation during the window with Jambos boss Steven Naismith admitting the Scotland front man showed exactly why he is such a key player for Hearts.
The manager said: “He is a top striker. He is somebody who we know is really important and that’s why we wanted to tie him down to a longer contract, that’s why we want him to be here as long as possible.
“A big bit of pressure on his penalty but again he shows his quality.”