Nigel Davies has vented his frustration at Irish referee Alain Rolland's handling of his Scarlets side's Pro12 clash with Munster.
The Scarlets coach saw his side record a 20-20 draw at Parc y Scarlets on Saturday but criticised Rolland's interpretation of the tackle area.
"It just wasn't refereed and I am very disappointed about that," said Davies.
The draw all but ended the Scarlets' hopes of making the Pro12 play-offs at the end of the season.
Rolland of Ireland was put in charge of the Scarlets' clash with Munster, which the Welsh side had to win to keep their Pro12 play-off hopes alive.
Davies felt his Scarlets side were on the wrong side of the penalty count at the tackle area against reigning Pro12 champions Munster, who guaranteed themselves a place in the play-offs with the draw on Welsh soil.
"It's hugely frustrating," said Davies.
"In tight games, referees will decide who wins and loses and I thought there were some clear-cut penalties for them [Munster] being off their feet and coming over the top and in at the side."
Davies admitted his own side's first-half performance and the number of unforced errors cost them victory, but it did not stop him from questioning Rolland's officiating of the match.
"Our own inaccuracies cost us, with too many turnovers, but having said that a couple of key decisions did too," said Davies.
"Even the last couple of scrums, when we brought Simon Gardiner on, they popped up. It would be interesting to see if we had a Welsh official in Ireland whether we would have had those calls."
Rolland will be remembered by most Welsh rugby fans as the referee who sent off Wales captain Sam Warburton for a tip-tackle in the 2011 World Cup semi-final in New Zealand.
The Scarlets are in fifth place of the Pro12, one place outside the top four play-offs, and four points behind fourth-placed Glasgow Warriors.