Greg Vanney hit out at a "purposeless" first-half display from his LA Galaxy side after their 2-0 loss to FC Dallas.
The Galaxy, who are third in the Western Conference, have now lost two of their last three games following that defeat to Dallas last time out.
They host the Colorado Rapids, who are one place and five points behind them in the West, next.
And Vanney wants a more aggressive performance.
"We were purposeless in the first half," Vanney said after the Dallas defeat, as reported by The Galactic Tribune.
"It's like we were going to win the game putting together ten thousand passes and going nowhere and that is what we said at half time.
"We were down 2-0 because we deserved to be down 2-0. We had three shots in the first half, all of them from 25 yards away.
"It just comes down to the overall aggressiveness of our group."
Wingers Gabriel Pec and Joseph Paintsil could not wield their usual influence on proceedings in the first half against Dallas, though Vanney believes the Galaxy stumbled on a solution after the break.
He added: "In the second half, we were able to get [Pec and Paintsil] better looks.
"One-on-one situations or getting them on the run so they're attacking aggressively, and then they have an impact on the game. We've got to do more of that. I'm not interested in being a possession team for the sake of passing the ball around.
"We need to use possession to put the opposition on their heels to score goals to bury them and make them feel like we're relentlessly coming at them, not so they can set up and be comfortable and turn us over and go the other way."
PLAYERS TO WATCH
LA Galaxy - Gabriel Pec
Pec has been involved in a goal in nine straight home matches (8 goals, 6 assists), equalling the longest single-season streak in Galaxy history (Landon Donovan in 2005, Robbie Keane in 2012).
Keane had a streak of 10 straight home matches with a goal contribution spanning the 2012 and 2013 seasons.
Colorado Rapids - Jonathan Lewis
Lewis has scored four goals in nine career matches against the Galaxy while not scoring more than twice against any other opponent.
All four of those goals were scored at Dignity Health Sports Park, including one in Colorado's 3-1 win at the Galaxy last May.
MATCH PREDICTION: LA GALAXY WIN
Colorado have lost only one of their last seven matches (W5 D1) conceding three goals in that lone defeat (at Los Angeles FC) and conceding a total of four goals in the other six games, not allowing more than one in any of them.
The Galaxy have won seven of their last nine home matches (D1 L1) with the only loss in that time coming at the Rose Bowl against LAFC. LA have not lost at Dignity Health Sports Park since a 4-1 defeat to Dallas last October, avoiding defeat in 10 straight matches in Carson (W7 D3) since.
Colorado, however, have won seven of their last 11 matches against the Galaxy (D3 L1) dating back to 2018. The Rapids had won six of their previous 24 meetings with the Galaxy in all competitions dating back to April 2009.
OPTA WIN PROBABILITY
LA Galaxy - 53.7%
Colorado Rapids - 22.6%
Draw - 23.8%