The players trained on Saturday at Milanello. Alex and De Sciglio completed the session.
The 2015 edition begins on Sunday in collaboration with AC Milan.
The AC Milan Youth Sector continues to be a vital resource for the national teams.
Menez and Mexes took part in a hangout on Google+ on Thursday.
Special offer of match tickets and Milan shirts for the under-14s.
Alex, Zapata and De Sciglio trained on Friday with the rest of the squad.