Pogba made just three appearances for United before he joined Juventus in 2012.
The France international failed to gain a regular starting place under Sir Alex Ferguson but he has since become one of the most sought-after young talents in Europe.
And Ballack believes United should never have let him go.
“It seems like it was a mistake from Manchester [United] to let him go,” Ballack told Sky Sports.
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Michael Ballack says Paul Pogba should never have left Manchester United
“He has this desire. His physical ability is there. He also has the nous to read situations, and to be in the box to score goals.
“He can still improve that, and if he does he can be an outstanding player.”
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