The former Hellas Verona coach was appointed by Lazio last week.
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And Marotta admits he's a fan of Baroni and says the Rome club has chosen well.
He said: "Baroni? They couldn't have made a better choice at Lazio. I had Marco at Juventus Primavera and, in addition to being a good person, I assure you that he has an impressive preparation.
"He won't disappoint, indeed you will see what an exemplary professional."