Warriors captain Roger Tuivasa-Sheck admits he played the worst 40 minutes of his NRL career as his side capitulated in the second half of Saturday's 36-28 defeat to Penrith.

In his 100th NRL game, the Warriors fullback made several uncharacteristic defensive and handling errors as the visitors blew a 26-8 halftime lead to concede five unanswered tries to the Panthers.

The 23-year-old is usually among the side's best and most reliable players but the former Sydney Roosters premiership winner concedes his second-half outing was his worst performance since making his NRL debut in 2012.

"That's definitely fair to say," Tuivasa-Sheck told D'Arcy Waldegrave on Radio Sport.

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"We've done a bit of work on our back field over the last couple of weeks and for that to happen like that...There were a few values that I didn't play to, like letting the ball bounce and being the first on to the ball and stuff like that.

"I'm just really disappointed."

Tuivasa-Sheck and the Warriors other senior leaders spoke to the team following each Penrith try, stressing the importance of defending strongly as they tried to wrestle momentum back in their favour.

Despite delivering the right messages, the Kiwis international concedes he could have done more to lead the way as the Panthers came surging back into the match.

"I talked about the process but needed to be more direct on what the process looked like and how we were going to bring the team back into winning," he said.

"Penrith got the jump on us every time. They were breaking through our middles and then my back field work wasn't great too.

"We took a real backward step there and it happened constantly. We kept on trying and were talking about the momentum swing but just couldn't get it back."

Tuivasa-Sheck admits the Warriors sorely missed the presence of lock and former skipper Simon Mannering, who was ruled out of the match after suffering a hamstring strain last Wednesday.

The 30-year-old 267-game veteran remains in doubt for Friday's match against St George Illawarra at FMG Stadium Waikato in Hamilton, but is expected to be fit for next week's round 12 clash against Brisbane.

"It would have been good to have him out there just with what he brings to the team especially on the defensive side.

"He's just someone that sparks that middle and we were missing that."

Tuivasa-Sheck understands tensions are running high and patience wearing thin among disheartened Warriors fans, with some supporters burning their club jerseys in the hours following their latest defeat.

"Winning and losing is a part of the game and unfortunately we lost in a big way.

"I just feel like they are really passionate about our team and they took that loss really personally.

"I can't really say or do much about that, we've got to get ready for another game this week."