Scarlets head coach Simon Easterby rued a late try that gained Clermont a bonus point in their 32-11 Heineken Cup win over his side.
Saturday's victory preserved Clermont's fine home record at Stade Marcel Michelin, having only led the Pro12 side 6-3 at the break.
Four second half tries left Easterby's men staring at 21 point defeat, however, with the French outfit sitting atop Pool 4.
"I am very proud of the way the boys dug in, we didn't give up," Easterby told the South Wales Evening Post.
"But in the end I am disappointed that we offered them the bonus point.
"There was a huge amount of work put in, the effort from everyone was clear to see.
"I am just annoyed that we have given them a bonus point that they didn't deserve.
"Clermont are a fantastic force when they have got momentum, we defended our hearts out, but I don't think they were a bonus point win better than us."
Easterby did take heart from the way the West Wales region initially kept pace with the Top14 giants, but knows they will need to improve ahead of the return fixture next week.
"I think we have shown we can compete with this team," added Easterby.
"There are a lot of sore bodies in that changing room, but we have competed against a side with a far bigger budget than ourselves.
"We tackled our hearts out and dug in, but ultimately in this competition, you have to be a bit better than that.
"We have to be harsh on ourselves because we have to take opportunities when we get them."