Danny Cipriani insists London Wasps need to improve despite a thrilling 25-24 win over Clermont Auvergne.
The England hopeful produced a man-of-the-match performance at Adams Park to move the reigning Heineken Cup champions top of Pool 5.
But Cipriani wants his team-mates to step up a gear when they face Munster and Llanelli Scarlets in their remaining matches.
Cipriani said: "We're very disappointed not to have picked up a bonus point and we've let them in.
"It was the communication in the backs and it's not good enough.
"In the first half we had a good platform and were able to play the ball wide because we were playing with such confidence.
"But in the second half we lost our way going wide and we need to sit down and talk about it and work out how to change it.
"We can definitely win this pool because we're got the squad to do it."