Carragher will retire this weekend.
"It has been a massive achievement when you think of the players that Liverpool have had over the years - Jamie is up there with the greatest," Fowler told LFC TV's new 'Carragher' documentary.
"When he first got into the side, probably people didn't expect him to become the player he was. He was a little bit raw. But we've seen over the years what he has grown into.
"He has been unbelievable in terms of his playing; he's played many positions but he's always excelled wherever he has played. He has never once moaned and he always put the club first.
"I think he should be applauded for that. Many players have come in and many players have tried to keep Jamie Carragher out of the side - no-one has done it."