But Gregor Townsend's side bounced back in fine style last Friday, handing the Ospreys a 35-17 beat down that mathematically assured them of a play-off place.
And Lamont insists he and his teammates now have their sights firmly set on the RaboDirect PRO12 title, even if Leinster's bonus-point win on Saturday did leave them facing an away semi-final in all likelihood.
"We know we can do it," said the 76-times capped 32-year-old.
"It is just a case of eradicating our errors and keeping the head. When we are not on form, things like Scarlets happen. We know what we can do and if we can stick to our game plan we will put that pressure on.
"We have been good away. You can't have the immaculate season. There's always one thing or another. That's all it was.
"We have been playing some good rugby, we had a good game against Munster, and then we got complacent and Scarlets gave us a good kick up the backside.
"I thought our forwards were immense [against Ospreys]. They were smashing the opposition. That aggression, throughout the XV, is something we lacked last week.
"When we've got it we are champions. It's that sort of level where we need to be for the rest of the season. It's important. We've got to get everything right."
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