Morrison???s deal expires in the summer and he has agreed a contract with the Serie A side, although he has not formally signed yet.
A very skilful performer, Morrison was a hot property as a youngster at Manchester United and has represented England at U16, U17, U18, and U21 level.
He was signed by the Hammers on a three and a half year deal in January 2012 but his career has stalled a little since his arrival and he has been sent to three different clubs on loan.
The 21-year-old spent time in previous seasons at Birmingham and QPR, featuring regularly for the London side towards the end of last season, although he was an unused substitute for their play-off final win over Derby.
This term he joined Cardiff on a three-month loan switch in September but he returned early in December.
Several clubs in Europe have reportedly expressed an interest in signing Morrison during the current transfer window but it looks like he has opted to let his contract expire before departing Upton Park.