Defensive guru Shaun Edwards accepts that Wales need to tighten up their tackling as they build towards the Rugby World Cup quarter-finals.
The Six Nations champions have conceded eight tries in three Pool D games, while official statistics revealed a high missed tackle count against Fiji on Wednesday.
"I realised we missed 25 tackles, then I thought to myself, 'who did we miss those tackles on?'" Edwards said.
"Then I looked, and there were 16 missed tackles on both of their wingers (Josua Tuisova and Semi Radradra) who, let's be honest, are not the easiest human beings to tackle.
"If anyone has an A-Z on how to tackle Josua Tuisova, please send me it. They are incredible athletes.
"Obviously, there were too many (missed tackles) but we only missed nine tackles on the rest of the team. Those two wingers are exceptional," Edwards said, before acknowledging the threat likely quarter-final opponents France posed out wide.
"France also have incredibly talented individuals, similar athletes, and we do need to improve that situation."
Wales are back in action on Sunday, tackling Uruguay at Kumamoto Stadium.
A fourth successive win would make it the first time since 1987 for them to go unbeaten through a World Cup pool phase.
And they will be red-hot favourites to post a third bonus point victory from four starts, setting them up for a showdown with Les Bleus.
Edwards will again set the players a target of points conceded - they hit it against Fiji.
"I set realistic targets because you have to realise there has never been as many points scored in rugby union as there is now," he said.
"If teams get near your try-line, it's pick-and-go after pick-and-go. It is incredibly hard to get the ball."
Edwards, meanwhile, delivered a positive update on centre Jonathan Davies, who is recovering from a knee injury while lock Adam Beard completes his comeback from appendix surgery a month ago when he lines up against the South Americans.