The Reds were widely expected to run riot against Newcastle United on Sunday after beating Southampton 6-1 in the Capital One Cup last week.
Instead they were a shadow of themselves, with the Magpies putting in an impressive performance to come away with a highly valuable 2-0 win from the game.
A number of things went wrong for Klopp’s side at St James Park, but Hamann singled out their failure to retain the ball as a big problem they must look to improve going forward.
“I think overall, whoever is on the pitch, they have to improve their retention of the ball,” he told Sky Sports. "Today they were very un-composed, they lost so many easy balls, their passing was off and this is why they didn't create any chances and only had one shot on target.
"I think their strength at this moment in time will be away from home because without their creative players they are struggling to create chances."
One man who is naturally key to Liverpool’s ability to keep the ball is Brazilian Philippe Coutinho.
He was missing for the loss to Newcastle and it showed, with the rest of the players in the squad failing to adequately replace the creativity he brings to the side.
With them eyeing a place in Europe come the end of the season, manager Jurgen Klopo and Liverpool will be hoping that Coutinho does not spend too much time on the treatment table in future.