He was owned by Udinese and only left on loan in January, so his teammates were particularly stunned ahead of tonight's planned game with Inter.
"We are truly shocked by what happened to Morosini," said Inter captain Zanetti in a statement.
"We are all struck deeply. Something incredible happened and it was clearly the right decision to call off the games.
"On behalf of all my teammates, our thoughts and embraces go to his loved ones."