The West Yorkshire outfit played out a goalless draw with Charlton Athletic away from home at The Valley in the Championship.
The performance of the Whites in the first 45 minutes was disappointing and left much to be desired, but the players raised their game in the second half and could have picked up all three points.
Dallas, who joined Leeds from Championship rivals Brentford in the summer transfer window, has revealed the message Evans gave to the players during the half-time team talk.
“In the first half we were below the standards we set last week,” the 24-year-old told Leeds’ official website.
“The manager told us that at half-time and we knew we had to improve in the second half. I think, in the end, there was only really one team who looked like they were going to win it.”
Over the course of the 90 minutes at The Valley, visitors Leeds had 56% of the possession, took 18 shots of which just three were on target, and earned eight corners.
The West Yorkshire outfit are now 18th in the Championship table with 23 points from 20 matches, seven points above the relegation zone.
Leeds will return to action on Thursday evening when they take on Wolverhampton Wanderers away from home at Molineux in the league.