Kevin-Prince Boateng has been joined at Fiorentina by former Sassuolo team-mate Pol Lirola.
AC Milan's latest attempt to move on from a difficult few years begins next month, with new coach Marco Giampaolo facing Udinese away first.
The arrival of Antonio Conte has restored a little optimism to Inter, but they look set for a testing start to the new Serie A season.
Maurizio Sarri will face former club Napoli on matchday two of the new Serie A season – Juventus' full calendar is here.
Juventus begin their Serie A defence and Maurizio Sarri's reign away to Parma, while Antonio Conte and Inter get started at home to Lecce.
West Ham have offloaded midfielder Pedro Obiang to Sassuolo, with the former Sampdoria player securing a return to Serie A.
Serie A champions Juventus signed defender Merih Demiral from Sassuolo.
Stefano Sensi was rewarded for his performances for Sassuolo with his first Italy caps last season and he has now earned a move to Inter.
Sassuolo's chief executive suggested Kevin-Prince Boateng might join Barcelona permanently, but the forward has confirmed his Camp Nou exit.
Young striker Andrea Pinamonti has left Inter for Genoa after making five appearances at senior level for the Nerazzurri.