Toulon boss Bernard Laporte picked holes in his side's quarter-final victory over Wasps despite advancing to the last four on Sunday.
The reigning champions were 32-18 winners at the Stade Mayol to set up a semi-final with Leinster in Marseille in two weeks time.
Missing chances to finish off the contest irritated Laporte, although he added that he was "very proud" to have made the semi-finals for the third straight season.
Laporte also described returning fly-half Frédéric Michalak as "excellent", with the former France star enjoying a fine day off the kicking tee with six penalties and two conversions.
"In terms of efficiency, this wasn't our best game, except for Frédéric Michalak who was excellent," Laporte told the EPCR website.
"We knew that Wasps are a very mobile team, they like to move the ball around a lot. We said during the week that this game would not be easy for us.
"We should have killed the game off in the first half but failed to score two tries we should have scored. They scored when one of our defenders slipped and fell. It's seven points here, seven points there and in the end that's a lot.
"Still, I am very proud. This is the third time we have got to the semi-finals but we want to go further and win the championship.
"I wasn't worried when Wasps got back seven points behind us, but I thought to myself, "they are still in there". We failed to kill the game, and we didn't make it as easy as we could have at some point.
"We didn't do what we needed to do last week to win against Toulouse, but credit to the boys for stepping up today.
"I'm looking forward to the semi-final in Marseille in two weeks, I hope a lot of people will show up to support us, because we will need a full stadium behind us."