The Uruguayan arrived on Merseyside from Dutch club Ajax Amsterdam in January and proved an instant hit, scoring four goals and providing five assists in 12 Premier League appearances.
Now Molby feels the 24-year old can go on to bigger and better things after finally being picked up by a big English club.
"I found it amazing he was allowed to play in Holland for as long as he did, with his goals record and what he's done internationally as well," Molby told LFC TV.
"I never had any doubts. He can play anywhere on the field, and by that I mean he pops up everywhere and is almost impossible to mark.
"He's a very comfortable two-footed player, he sees a pass, he can dribble. I always say to people: that's what a good player looks like.
"We have a great, great player at this club and his job now is to go on and become one of the all-time greats at Anfield, and he's got all the tools to do that."