"It was very frustrating," Rodgers said.
"It was a game where I felt we were the much better side, but we lost our concentration at the beginning of the second half and I thought we'd moved on from that to be honest.
"I thought we were just lazy - that is the easiest way to describe it.
"Just lazy in our play and loose and sloppy. It is as simple as that.
"In that opening period (of the second half) we didn't do what I call the dirty bit.
"In the first half we earned the right (to be in front) - we pressed the ball, got tight and then showed our quality with the ball.
"But at the beginning of the second half we didn't do that, and before we knew it, we were 3-1 behind."