Brendan Rodgers has blasted his players for not performing in their 3-2 FA Cup shock defeat to Oldham Athletic.
Oldham's Matt Smith netted twice in the first-half, before Reece Wabara scored the Latics' third goal three minutes after the break.
Liverpool's skipper for the day, Luis Suarez, had equalised for the Reds on 17 minutes, before Joe Allen's volley caused a nervy last ten minutes for the Oldham defence.
Rodgers told Liverpool's official website: "We're bitterly disappointed. We started the first-half really poorly, and we started the second-half poorly too and got punished.
"The result is very disappointing. We picked a team to come here and win the game - we know we've got a big week of games - but our mentality in that opening period was poor and ended up costing us."
Former Swansea boss Rodgers picked a fairly experienced side for the fourth round tie, selecting Suarez, Fabio Borini and Daniel Sturridge up front.
Despite using second keeper Brad Jones, Rodgers chose a relatively inexperienced back four, playing youngsters Sebastian Coates, Jack Robinson and Andre Wisdom alongside Martin Skrtel.
Rodgers added: "I was disappointed with the young players today.
"We're trying to give them experience and let them see what it's like to play for Liverpool.
"It's not just about playing for Liverpool, you've got to be able to be competitive and be a part of a group that is going to challenge for trophies."
This is the second year in a row these two sides have met, with Oldham gaining their revenge on last year's finalists, after losing 5-1 away at Anfield in the third round.
The Latics now have the chance to complete a Merseyside double, after drawing Everton at home in the fifth round of the FA Cup, while Liverpool will be hoping to bounce back against Arsenal in the Premier League on Wednesday.
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