"[2] Morosini started his career at hometown club Atalanta, and was sold to Udinese in a co-ownership deal during 2005.

[7][8] On 14 April 2012, while representing Livorno, Morosini suffered cardiac arrest and fell to the ground in the 31st minute of the Serie B match away to Pescara.

[11] According to the news agency ANSA, a city police car was blocking the stadium's exit for the ambulance for nearly a minute, but a heart specialist said that the delay made no difference.

[12] After Morosini was taken to the hospital, the match was abandoned with Livorno leading 2–0, and some players reportedly "left the field in tears".

[14][15] Italian media reports were alerted of Morosini's death after an "explosion of shouts and tears" by his teammates who had gone to the hospital.

[18] Morosini's death came four weeks after Fabrice Muamba suffered a cardiac arrest in an English FA Cup match, after which awareness of heart risk had been raised in Italian football.

[21] On the third anniversary of his death, Juventus goalkeeper Gianluigi Buffon dedicated his side's 1–0 away win over Monaco in the 2014–15 UEFA Champions League quarter-final to Morosini.