The Croatia international will not serve the ban this season, with Milan suspended from playing European football for a year after breaching Financial Fair Play regulations, but his punishment for a bad challenge and his reaction to it comes along with a number of sanctions for his parent club, Eintracht Frankfurt.
The incident occurred before Rebic joined Milan on a two-year loan, when he slid in studs-first on Strasbourg goalkeeper Matz Sels and was shown a straight red card during Eintracht's 3-0 UEFA Europa League victory in August.
Along with Rebic's suspension, the UEFA Control, Ethics and Disciplinary Body (CEDB) announced the partial closure of Eintracht's Commerzbank-Arena for the next UEFA competition match hosted by the Bundesliga club, after fans threw objects during the same game.
The CEDB also announced the partial closure of Royal Antwerp's stadium for one UEFA competition match after supporters threw objects, set off fireworks and held up an illicit banner in the club's UEFA Europa League play-off defeat to AZ.
Antwerp goalkeeper Sinan Bolat will serve a three-match European suspension for insulting a match official in that game, and Antwerp must pay a €46,250 ($74,441) fine.
Celtic has also been fined after its supporters were involved in a number of incidents during their 4-1 UEFA Europa League play-off second-leg victory over AIK.
After the setting off of fireworks, blocking of stairways and throwing of objects during the match, Celtic must pay a €12,500 ($20,119) fine, while AIK has been fined €8000 ($12,876).