Costantino began his youth career with SPAL 1907, and remained with the central Italian club's junior squad until July 2009, when he was transferred to Serie A side U.C.
[2] Ex-Sampdoria head coach Luigi Delneri and sports director Giuseppe Marotta were appointed as the same positions in Juve and played a role in bringing the youngster to Turin.
He joined Juventus in order to strengthen the Primavera team but was immediately promoted to the senior squad as their no.1 Italian international Gianluigi Buffon was injured for several months.
He was registered in Juventus's 24-men UEFA Europa League first team squad (list A) as the fourth keeper, behind Gianluigi Buffon, former Sampdoria teammate, Marco Storari and Austrian international, Alex Manninger.
[3] Juventus also registered young Primavera player Marco Bonassi in B list in qualifying and playoffs phase,[4] but soon left the club on loan.