The Barcelona striker, 37, has been linked with a Bosman move to Juve in recent days.
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But Ravanelli told La Gazzetta dello Sport: "It would be the wrong message for the fans and for the club's plans.
"It would be a step backwards.
"Not because Lewandowski isn't up to the task—we're talking about a champion. But they need players with a bright future and Juve DNA. I think the club should look for other players. Lewandowski is 37."
He added, "The scouting team needs to be good at identifying a striker who can win something important in the future. There are only a few ready-made players, and they're very expensive."