Newcastle Falcons boss Dean Richards vented his frustrations over the refereeing of his side's 20-34 loss to Wasps on Sunday.
Their latest defeat leaves Newcastle just four points clear of safety at the bottom of the Premiership after London Irish picked up a losing bonus point away to Worcester.
Richards felt that his side had been hard done by, citing a lack of consistency from the referee JP Doyle and his assistants.
"I'm more disappointed than angry – bitterly disappointed in fact," Richards explained.
"We ended up having the same thing today as we had at Bath when we should have had a penalty in the final minutes of the game.
"The referee was told by his touch judge that one of their players had come in the side but he ignored him and penalised us instead.
"We seem to have to be whiter than white and even then other sides seem to get away with it. There is a complete lack of confidence in the standard of refereeing at this time.
"We just want consistency from the referees and we're just not getting it at the moment. The players are losing heart in their understanding of what the referees want.
"We just want to play on a fair footing with everyone else and we're just not getting that at the moment. There's absolutely nothing you can do about it but there is clearly inconsistency in interpretation by the referees."
Wasps boss Dai Young meanwhile was glad to see his side come out on top in a potentially tricky fixture, as Wasps set their sights on making the playoffs.
"The result at this stage of the season is probably more important than the style," Young said.
"We played really well in patches but our discipline was a problem and we gave away too many penalties.
"I was a bit concerned with 15-20 minutes left but you have to be pleased with five points because it's never easy at Newcastle.
"We expected it to be hard and Newcastle have some quality in their squad. We scored some good tries but we really had to scrap for it and I was pleased with our defensive work-rate – and we stuck to our structure.
"We've been better this season but the attitude and desire was there."