Bernardo starred at St. Benedict's Prep in New Jersey before joining Napoli. Nazzani was born to an American mother and Italian father and has been in the Bologna system since he was 11.
Other European-based players whom Coach Thomas Rongen called into the camp that ends Monday are three Floridians Bryan Arguez, Gabriel Hoyos and Matt Luzanaris.
Arguez and Hoyos are in Germany at Hertha Berlin and Freiburg, respectively, while Luzanaris, who played one season at UCF, is at Austria's FC Magna Wiener Neustadt.
U.S. U-20 CAMP ROSTER:
GOALKEEPERS: Sean Johnson (Univ. of Central Florida), Josh Lambo (FC Dallas), Brian Perk (UCLA)
DEFENDERS: Giuseppe Nazzani (Bologna, Italy), Ike Opara (Wake Forest Univ.), Pat Sigler (Cal Poly), Chris Taylor (Univ. of Tulsa), Anthony Wallace (FC Dallas), Marcus Watson (L.A. Galaxy Academy), Daniel Wenzel (Wake Forest Univ), Sheanon Williams (Univ. of North Carolina)
MIDFIELDERS: Bryan Arguez (Hertha Berlin, Germany), Daniel Cruz (UNLV), Jorge Flores (Chivas USA), Blair Gavin (Univ. of Akron), Gabriel Hoyos (Freiburg, Germany), Abdusalam Ibrahim (Toronto FC), Aaron Maund (Notre Dame Univ.), Brian Ownby (Univ. of Virginia), Michael Stephens (UCLA), Kirk Urso (Univ. of North Carolina)
FORWARDS: Vincenzo Bernardo (Napoli, Italy), Sam Garza (Univ. of Denver), Matt Luzanaris (FC Magna Wiener Neustadt, Austria), Peri Marosevic (Univ. of Michigan), Colin Rolfe (Univ. of Louisville).