Aquilani was on loan at AC Milan last season as he looked for a permanent move from Liverpool.
A statement on the Liverpool website read: “Liverpool Football Club can today confirm that Alberto Aquilani has completed a permanent transfer to Serie A side Fiorentina.
“The Italian midfielder joined Liverpool in 2009 but made just 28 first-team appearances having spent the last two seasons on loan in his homeland.
“Everyone at the club would like to wish Alberto all the best for the future.”
