At United, the Italian eventually forced through a loan move to Sampdoria.
It was the beginning of the end of his time as a United player, and one he now admits was a mistake.
“I wouldn't make that decision again," Macheda told Goal. "I once said that going to Sampdoria was a mistake because it was a negative experience for me but it's part and parcel of a footballer's career.
“Sometimes you take a good, sometimes a bad decision. That one was a bad one. But it was a good lesson, which taught me a lot."
The Sampdoria spell was Macheda's first of five clubs he toured temporarily, before eventually departing United permanently for Cardiff in 2014.
He added: “In Manchester I grew up not only as a player but also as a man and I will always cherish those wonderful memories of my time playing for the biggest club in the world."
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