Aberdeen boss Stephen Glass pointed the finger of blame for the defeat to St Mirren at his own side.
Connor Ronan curled home a sublime winner to move the Buddies within three points of the Premiership top six.
But the Dons' blew the chance to climb into the European spots after a disappointing display in Paisley.
At the full-time whistle, Glass didn't hold back on his Aberdeen players.
He raged: “It wasn't good enough - the creativity in the final third wasn't good enough.
“One moment of quality wins it for St Mirren and it's disappointing with the possession we had that one of our players didn't do it.
“We knew we'd jump a couple of places with three points. A certain amount of mental toughness is required so if you don't win a game like that then you don't lose.
“The boys aren't happy - nobody is - but we have to put that right on Saturday.”
Delighted St Mirren boss Jim Goodwin reckons scorer Ronan could have put himself in line for an Ireland call-up after his display.
The Buddies boss said: “It was a brilliant goal and I think he can go again. He's not the finished article - there's still room for improvement.
“Jamie McGrath has had that international recognition and Connor is capable of doing the same.
“The FAI are well aware of the quality he has and he just needs to keep doing that.
“If he continues with performances and goals like that - it'll be shown over social media and on TV - then no doubt Stephen Kenny will see it.”
Contract rebel McGrath was back in Goodwin’s line-up after missing two game having complained he was not in the right mental state to play following the collapse of his move to the Dons.
But Goodwin - who held clear-the-air talks this week - said: “Jamie's a St Mirren player until I get told otherwise. He was magnificent and showed the fans he cares and is committed to doing his best. I thought he was excellent.”
