Liverpool boss Jurgen Klopp says his side were “not fresh enough, mentally and physically” as Brighton consigned them to a second straight home defeat.
Steven Alzate scored the only goal of the game to inflict further damage on the Reds’ faltering title defence.
They are now seven points behind Premier League leaders Manchester City, having played a game more.
“It has been a really tough week with two away games, two very intense games,” said Klopp.
“We looked really like we weren’t fresh enough, mentally and physically.
“There were a lot of moments where we gave the ball away too easily, in moments the boys looked tired mentally. I know they can pass the ball from A to B but it didn’t happen. We made it easy for Brighton, but they also did really well.
“Brighton deserved to win, no doubt about it. For me, it’s more important to find an explanation for why we lost this game and understand what happened here…
— to www.bbc.co.uk