Paolo Condò who is one of the most important journalists at the Gazzetta dello Sport has written about why Mancini has chosen Sylvinho as his assistant manager:

“Mancini wanted an assistant coach who could bring and teach him something new, not someone who would just copy what Mancini already has. Sylvinho will give Mancini a bit of Wenger, Rijkaard and Guardiola.”

Source: Fcinternews.it