The Reds now face a trip to Devon for the third-round replay and have six remaining in January.

Klopp's side also play Southampton in a two-legged EFL Cup semi-final and Premier League games against Manchester United, Swansea and Chelsea.

However, the German boss said: "I don't think the line-up was a mistake."

Asked about the long, midweek trip for the FA Cup replay, a 19:45 GMT kick-off on 17 January, Klopp added: "Yippee. I don't know if at home they can play the same defensive style. We are looking forward to it."

Liverpool's starting line-up on Sunday had an average age of of 21 years and 296 days.

Forward Ben Woodburn, 17, is the club's youngest goalscorer after his strike against Leeds in the EFL Cup earlier this season and he was given his first start.

Trent Alexander-Arnold, 18, and 19-year-olds Joe Gomez - making his first appearance since suffering a knee ligament injury in October 2015 - Ovie Ejaria and Sheyi Ojo were also in the side.

At 29, Lucas was the oldest Liverpool player.

"I am responsible if you want to see it in a bad way," added Klopp.

"I always choose line-ups to win the game. We didn't think about the age. They are important players in our squad."

First-team regulars Daniel Sturridge, Adam Lallana and Roberto Firmino were brought on during the second half, but the hosts - who had enjoyed 80.3% possession in the first period - continued to be frustrated.

"We could have done better, 100%," said the Reds boss. "In the first half we lost patience too early - crossing at the wrong moment, making the wrong pass.

"We had the ball all the time. It was boring, not the most exciting game."

'Welcome to the real world'

Plymouth, who are second and challenging for promotion from League Two, limited Liverpool to four shots on target.

"It is probably one of the best defensive performances Anfield has seen," said Plymouth boss Derek Adams. "We allowed them time but didn't allow them space.

"This was about a team performance. We had 13 players and they all deserve a huge amount of credit."

Asked what Liverpool could expect in the replay at Home Park, he added: "Welcome to the real world."

(BBС)