Liverpool boss Kenny Dalglish said his team's attitude was poor as they lost to Fulham ahead of the FA Cup final.
Martin Skrtel's own goal after five minutes earned Fulham their first ever win at Anfield.
And though Dalglish made nine changes to the side with Saturday's Wembley final against Chelsea in mind, he still questioned his team's commitment.
"I don't think that can be described as a performance and I take part of the blame I suppose," he told BBC Sport.
"I thought it would be fair to everybody to give them an opportunity to get some minutes on the pitch with a game coming up on Saturday that's important to the club, to try and put their case forward.
"But the performance and the attitude was very poor and that's not like us.
"There were one or two positives but there were a lot more negatives."
Andy Carroll was restored to the attack as Luis Suarez, Steven Gerrard and Pepe Reina were all rested.
But even though there were regular players on show, Fulham looked comfortable throughout and could have scored in the second half when Kerim Frei hit the post and Clint Dempsey's close-range shot was saved by Alexander Doni.
The defeat was Liverpool's fourth in the league at Anfield this season and means they have won three games in their last 13 top-flight matches.
Dalglish admitted the change in personnel backfired and hoped it would serve his side with a lesson.
"Take some pride in yourself and the club and go and play," Dalglish urged afterwards. "It was an opportunity to play, go and play. The goal was unfortunate for us, but I think we got what we deserved and that was absolutely nothing.
"If you don't approach the game properly then you're going to get nothing and if we needed a lesson, then there was that lesson."