Jamie Carragher revealed the 'unforgivable' moment in Liverpool's crushing defeat to Everton.
Liverpool's Premier League title hopes were dealt a major blow at Goodison Park on Wednesday.
The Reds succumbed to local rivals Everton, who ran out 2-0 winners to secure all three points and bragging rights.
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Jurgen Klopp made five substitutes in a bid to turn the game around as Liverpool fans bemoaned one of his decisions.
After the match, Carragher, Daniel Sturridge and Wayne Rooney, who called out Virgil van Dijk's post-match interview, were on hand to analyse Liverpool's defeat.
And Carragher pinpointed Darwin Nunez fluffing his chance in the first-half, calling it 'unforgivable' in a damning moment.
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With his side trailing following Jarrad Branthwaite's opener, Nunez was played through on goal but blasted his effort straight at Jordan Pickford, who denied him an equaliser.
Speaking after the game, the Liverpool legend slammed the Uruguayan forward's decision making in front of goal and questioned his development following his £85 million transfer.
"The chance that Nunez misses before half-time, that is unforgivable at this level. That is not acceptable at this level, certainly when Liverpool are going for the title," he said on Sky Sports.
"I think there is a question to ask. You want him to do well because there is so much that you like because he gives everything, he runs and causes trouble and gets the odd goal and gets an assist.
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"But after two years when Liverpool this season are going to the title and those big games, you need your man to score away at Old Trafford, away at Goodison, in the European game at Atalanta. There is no time to waste, this is not October or November. This is the business end."
Carragher added: "In terms of Nunez and where the club go forward now, we have all been in squads where someone comes in and maybe you talk about the first year and maybe say, okay he’s getting up to speed with and he’s improving, and it looked like he was at the start of the season. But it has ground to a halt.
"You are looking at it now and after two years, I don’t think there is going to be a massive improvement in him. What we have seen in the last two years is what he is.
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"He can cause trouble, he can be erratic with his finishing. I don’t think it is going to be enough to win you the biggest trophies so I think there is a big decision to be made on him in the summer."
Topics: Liverpool, Jamie Carragher, Darwin Nunez, Football