Sassuolo midfielder Jasmin Kurtic claims he turned down a move to Leeds United in favour of joining Fiorentina on loan.
Sassuolo and Cagliari shared the spoils in a 1-1 draw in their first Serie A match of the new season.
AC Milan beat Lazio 3-1 in Filippo Inzaghi's first Serie A game in charge, while Inter Milan's Nemanja Vidic saw red.
Sassuolo have signed Croatia full-back Sime Vrsaljko from Genoa for a reported seven million euro fee.
Serie A champions Juventus ended the season with a record 102 points after a comfortable 3-0 win over Cagliari.
AC Milan missed out on a Europa League qualifying place despite seeing off Sassuolo on the final day of the Serie A season.
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