Edinburgh head coach Alan Solomons was fuming after his side's 22-21 loss to Scarlets, saying PRO12 games need "three neutral officials".
A late three points from the boot of Scarlets replacement Aled Thomas denied the Scottish side a come-from-behind victory at Parc y Scarlets.
That decision arose when the officials penalised an Edinburgh player for being offside, something which Solomons strongly disagrees with.
"The last penalty, when I looked on the television there was no offside and I think it is time in this competition we have three neutral officials," he told BBC Wales, with Irishman Andy Brace the referee and two Welshman, Leighton Hodges and Craig Evans, his assistants on Friday.
Solomons added: "I thought we did enough in that second-half to win. We made too many errors in the first-half. All of their points came from our errors.
"In the second-half we improved on that and I thought it was a really good effort to get back into the game."
Asked what his next step would be on the late penalty decision, Solomons said he would go through the correct channels to make his feelings heard.
"I'll work through the referee manager Ed Morrison," he said. "We're really disappointed not to get the win there at 21-19 we thought that game was ours and deservedly so."