Leeds United suffered a 1-0 defeat to Rotherham United at Elland Road in the Championship on Saturday afternoon.
The 18-year-old midfielder started the Championship game for Leeds at Elland Road and played for 85 minutes.
"Lewis Cook had a poor game today, he couldn't really get into the game,” Evans told BBC Sport.
Cook took two shots, had a pass accuracy of 79%, attempted one dribble, and made interception and two blocks.
Leeds failed to make it three wins in a row in the Championship, as they suffered a 1-0 defeat to Rotherham.
Joe Newell’s headed goal in the 54th minute proved to be the difference between the two teams.
Over the course of the 90 minutes at Elland Road, the Whites had 60% of the possession, took 14 shots of which just three were on target, and earned nine corners.
Visitors Rotherham had 40% of the possession, took nine shots of which three were on target, and earned four corners.
Leeds are 16th in the Championship table at the moment with 19 points from 17 matches, just four points above the relegation zone.
The Whites will take on Queens Park Rangers away from home at Loftus Road in the Championship next weekend.