"I have a huge concern because the spirit of the team isn't where it needs to be," McLellan said after the loss. "There has to be 10 guys in there that have so much pride that they pull the rest of the guys along."
McLellan, whose Oilers have lost five straight and are now tied with a league-worst 50 points, singled out defenseman Justin Schultz, who compiled a minus-3 rating.
"He had a pretty disappointing night as an individual, and it affected the team," McLellan said.
McLellan also wondered whether many of his players should be with the team past Monday's trade deadline.
"We'll see what happens over the next six or seven days," he said. "Maybe there are some guys waiting for that. It's got to get better or we need to make huge, huge changes."
The Oilers (22-33-6) return to the ice Thursday in Los Angeles against the Pacific Division-leading Kings.
Information from The Associated Press was used in this report.