Les Bleus take on Georgia on Friday and Belarus next Tuesday, both away from home, looking to step up the pressure on Group I leaders Spain.
Since a 1-0 defeat to the reigning world and European champions in their last qualifier, France have drawn blanks in friendly defeats to Brazil and Uruguay and drawn 0-0 with Belgium.
And Tottenham goalkeeper Lloris - whose own area of the field has not been a problem, with only four goals conceded - told L'Equipe: "We know there are things we have to improve.
"In recent games, we have not been clinical enough. That will have to change if we want to win games."
He cautioned against taking Georgia lightly, though, despite Temuri Ketsbaia's men having picked up only four points from five group games. Three of those from an opening win over fellow strugglers Belarus, though they too lost only 1-0 to Spain.
"Games are not decided in advance," said Lloris. "There are no lesser nations any more, they have all evolved tactically and technically.
"They also showed against Spain that when they are well set up and they defend well, they are not easy to play against. We know what awaits us."
Bayern Munich winger Franck Ribery is back in training after a calf problem but Monaco newcomer Geoffrey Kondogbia sat out Thursday's session with a similar issue.
While the group's two big names vie for qualification, the realistic limit of Georgia's ambitions is third place and an improved seeding for the Euro 2016 qualifiers.
"That would be undoubtedly be a very positive development for Georgian football," Ketsbaia told Mundo Deportivo.
"In the match with France in Tbilisi, we must try not to let them kill the enthusiasm of the fans in the first few minutes."