The former Reds and Valencia defender told liverpoolfc.tv: "We never know if they will go on to become first-team regulars, but if these boys are here it's because they have the qualities and characteristics to be good footballers and be in the Liverpool squad.
"Emiliano Insua is an example. One week he was in the reserve team, the next he was on the bench, then the next week he was in the first team and now he is frequently in the starting XI. And he's played for his national team.
"The life of a young player can change in one month. You have to be ready in every moment because you never know when your moment will come."