Juve are in London for their latest Champions League clash.
Giaretta told TMW: "With Liverpool they now have something more, even at the group level, not just individuality. There are individuals who make up a team: in United there are individualists but not a group, a team. Chelsea are in great shape.
"They are strong, difficult to face. They have great ball possession, verticalise and hurt you. Juventus will also have to produce a high-level match, it's a difficult game.
"(Rmelu) Lukaku? He has characteristics that you do not replace, even the way the team plays.
"He has an important weight, the others do not have his characteristics but even in the last game without him his absence was not noticed."
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