Leicester Tigers director of rugby Richard Cockerill was critical of his side's second-half performance against Treviso on Sunday.
Leicester opened up a heavy 26-7 lead by half-time at Welford Road, clinching the try bonus point, before losing concentration in the second half and allowing Treviso back into the game.
The Italian side rallied in the second half to score two tries and make the final score 33-25, leaving Cockerill unimpressed.
"We were inaccurate - we went to sleep in the second half," said Cockerill.
"It certainly won't lead us to be complacent next week, so maybe it has done us a favour.
"We will have to be a lot better. Treviso were good, but I don't think we were under any illusions. Two years ago, we nearly lost away to Treviso in the first round of the pool stage.
"The players will know they are in for a tough afternoon next week. We have got to go there and try to get five points. Whether that is attainable, we will have to see.
"It was job done on this occasion with the five points, but no more than that."