Michael Maguire has slammed his side's effort against the Warriors as "not a Wests Tigers performance" after they surrendered the lead twice at the SCG on Friday night.
Maguire raised concerns despite the side leading by six points at the half-time break. He said their attitude was visibly off.
Those concerns were brought to light again by fulltime as the Warriors grabbed an inspirational win and delivered the Tigers another defeat that could cost them a finals spot in eight weeks' time.
Two tries to open the game looked promising for Maguire's men, but it soon fell apart as the Warriors lifted.
The base was set for the Warriors through their running metres (2006m) and offload count (18) – an area Maguire said came down to attitude.
Match Highlights: Wests Tigers v Warriors
"We dropped off, we scored two tries and suddenly they were walking us off the park," Maguire said.
"We needed some leadership and everyone to own their jobs in that moment of time to try and turn the momentum in the game.
"They just weren't prepared to go and find it. Like any team, you grow off the back of that and sure enough, the Warriors did that.
"Defence is all about attitude. We were rolled set after set through the park and weren't prepared to put our body in front so paid for it."
After making it clear a change in attitude was part of the club's quest to improve their culture following their shock round four loss to the Titans, Maguire conceded the most recent result was a step backward.
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"We've got to own in again, every single one of us, and look at the things to do to move forward," he said.
"We're determined to change the club. I keep talking about an 80-minute game but we played for 10 minutes there.
"We need to have a good look in the mirror. That's not a Wests Tigers performance anymore. That's not acceptable in and around the club.
"This is the expectation, it's been set and we've seen that."
Maguire said he will review the game before deciding if personnel changes were required but refused to use last week's physical encounter with Parramatta as an excuse.
"It's all between the ears," he said.
"We're determined to continually work towards the club we want to be. That's the goal and that's what we're going to be doing every day.
"If you're going to play NRL you've got to do it all the time. That's what we've got to take ownership of. You can't split attitude. It was a poor performance tonight."