Scarlets head coach Simon Easterby criticised his side after they bowed out of the Heineken Cup with a 29-0 defeat to Clermont-Auvergne at Parc y Scarlets.
Last season's semi-finalists rounded off a flawless Pool Five campaign by crushing the Welsh region, who were in generous mood defensively in a one-sided first period.
Easterby said afterwards: "We conceded 24 points in the first half and they did not have to work for a huge amount of those points.
"Any team where you conceded 24 points is going to be difficult, but a team like Clermont you dig a real big hole for yourself.
"It's frustrating. We just fed them too much in the first half. I think it was 70 per cent possession against and 70 per cent territory.
"We just need to be far more accurate. They scored off an intercept and fed off our mistakes. They are a quality outfit. We gave them too much of a headstart and gave them too much they didn't have to work for."
Clermont advance to face Top 14 rivals Montpellier at home, and their coach Vern Cotter added: "We are happy for our supporters because it is the first time we have booked a home quarter-final and it will be a very hard game."