Coppola's career began at native club Napoli, he was used as a backup goalkeeper for Giuseppe Taglialatela, Luca Mondini and Alessio Bandieri.

During the 2005–06 season, Coppola played all of the 38 Serie A fixtures, and saw Ascoli finish twelfth place in the table.

Coppola was signed by A.C. Milan in June 2006, for €200,000,[1] as a replacement for their third choice goalkeeper Valerio Fiori, who was set to retire from professional football.

[5] Before the start of the 2012–13, Coppola was sentenced to a six-month ban, later reduced to four months on appeal, for his involvement in the 2011–12 Italian football scandal.

[6] After serving the ban, during the January transfer window he re-joined Torino, this time on a permanent deal.