The former defender has outlined the reaction of football teams when new recruits enter the training ground for their initial sessions.
And some names from the recent past have proven to have put the first concerns behind them.
Carra recalled on Sky Sports: “Most of the time in Liverpool, the best players moved in very quickly, but I can think of a couple. I think Momo Sissoko was one.
“He ended up being a very good player for us in the midfield. A destructive type of player, not great technically.
“But in his first training sessions, he looked really bad with the ball.
“People are always wondering what it looks like when new recruits arrive, and professional footballers in the best clubs, or at any level, we are all the same as when you are with your friends five by side.
“If someone comes in new and the first few passes give or they have trouble with the ball, you all look at each other and say” oh what have we done? “What do we have here?”
“I think that was definitely the case with Momo Sissoko. “
Sissoko was part of the team that won the FA Cup in 2006 and played 87 times in total for Liverpool.
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Carragher also said that Dietmar Hamann had taken the time to settle in after arriving from £ 8 million in Newcastle in 1999.
He explained, “I think Didi Hamann was one of them too.
“It wasn’t that the player looked poor, but what he did in Liverpool… his first season, it took him a little while to show why we spent this money on him and what work he was going to be on the team.
“So obviously, it became a revelation and was part of this successful era of Gérard Houllier and Rafa Benitez.
“But the first season, you were sort of watching it and thinking you needed a little bit more, and that’s what Didi provided.
“But I would say that Sissoko was the big player you think, in six months you think” wow. He looks like a good Premier League player. ”