France travel to Twickenham wounded after losing their first two matches in the tournament and Lancaster feels that competition for places is keeping his young side focused on Saturday's match.
He told The Telegraph: "It's not for me to pick apart where it's going wrong [for France]. There's obviously areas we think we can exploit. We've got to make sure we win that set-piece battle up front and win quick ball.
"We've also got to deny them good line-out ball. If we can get good pace and tempo in our game and play with good width, then I think we're pretty strong.
"And we'll have a good bench to come on. That last 20 minutes will be crucial again. We felt that was going to make quite a difference going into last two games. Against France also we want to try to press home that advantage."
England are the only unbeaten side left in the competition with three matches still to play.