Spealong to CoinCasino, Hamann said: "I think Liverpool ending their interest in Arda Guler would be a mistake because we’ve seen young players leave big clubs and get a new lease of life.
"Alexander Isak was at Borussia Dortmund when he was 17 and it came too early, Guler went to Real Madrid and I think he is a huge talent who doesn’t get enough playing time because of the competition.
"Guler is the type of player who has huge potential, if you can find a role for him I think he will grow in confidence, he could be a huge player in the future and why not for Liverpool."