Oliver Glasner's choice to select the same back three in 10 out of their past 11 games has helped Crystal Palace to become defensively consistent, says former Premier League left-back Stephen Warnock.
"It's a big difference when you've got continuity in the backline - the two wing-backs Munoz and Mitchell, and the goalkeeper as well," Warnock told BBC Radio 5 Live's Monday Night Club.
"You have then got that continuity at the back and that understanding.
"It's not easy coming into a team when you're used to playing in a back four. Lacroix and Chalobah are pretty much used to playing in a back four. They've played in back threes before, but when asked to do it on a regular basis it's trying to understand when to step out and when not to.
"What you don't want to be as a centre-back is in a back three on the right or the left. You don't want to play right-back or left-back because it's not your job.
"These guys look fit again. They looked a bit fatigued at the start of the season and not quite at their maximum, but now they look so much better.
"Glasner is one of these managers who expects high work-rate in training all the time and the players have had to adapt to that. Even for the new players coming in, it's a different mentality than they're used to."