The Magpies suffered a heavy 5-1 defeat to Chelsea away from home at Stamford Bridge in the Premier League.
“You get one or two of these games a season,” McClaren told BBC Sport. “I’ve told the players don’t let that derail us. It was damage limitation by half-time. I just wanted to make sure we scored a goal and stayed in the game.”
Chelsea were on top of the game from the start to finish, and gave Newcastle no chance whatsoever of staging a comeback.
Over the course of the 90 minutes at St. James’ Park, the Magpies had 45% of the possession, took 10 shots of which only three were on target, and earned five corners.
McClaren’s side are now third from bottom in the Premier League table with 24 points from 26 matches.
Newcastle are level on points with 17th-placed Norwich City, but they are in the bottom three due to a worse goal difference.
The Magpies will return to action on March 2 when they take on Stoke City away from home at the Britannia Stadium in the Premier League.