Del Peiro, who won the World Cup and countless club honors, was speaking on CBS Sports as a pundit.
After Borussia Dortmund's 1-0 win over Paris Saint-Germain in the Champions League semi final first leg, Del Piero praised their star player Sancho.
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Del Piero told CBS Sports: "When a player like him can play these kind of games, with this kind of quality, you need to go to Man United.
Next year maybe, one more year, lets see how he feels, which coach, ok, everything, this kind of player needs to play every year at the top.
And Dortmund don't get me wrong, they deserve to be there, they may go to the final and win the Champions League, but (it would be) something extraordinary for that."