The Blues could not stand the Blades as Oli McBurnie’s header and David McGoldrick’s double made sure Chelsea went back to London without a point.
In an interview with Sky Sports after the game, Lampard admitted his side were outsmarted and outmuscled by Chris Wilder’s men and insists he has learned a lot from the seismic defeat.
“They were better than us, physically, in the mind and with the ball. So you lose the game. They were stronger than us,” the Englishman said.
“You feel and hear every noise and all I could hear was Sheffield United voices.”
“They are a good team. If you come here and perform below par this is what will happen.”
"We matched them shape wise. We were too slow and weren't getting our wingers into the game.”
“We tried to get control, which we did but weren't threatening. At 2-0 down you make it difficult for yourselves.”
“Disappointing. Mistakes. You analyse all season and review and move forward. We need to put that to bed quickly and fight for the top four. I learned a lot and I won't forget that.
"I am not concerned about top four today. All I do is sit and watch the games and consider what we want to do.”
“But today I am concerned with how we performed. We will see where we are when we approach Norwich.”
“But we can't approach Norwich or Manchester United or Wolves like we did today."
Chelsea will look to atone for their sins when they meet Norwich in their next Premier League game on Tuesday.