The Mirror says Mirallas will join Fiorentina on a season-long loan subject to a medical.
The Goodison Park club announced the move on Saturday morning after days of speculation.
Since joining the Toffees in a £6million deal from Greek side Olympiakos in 2012, Belgium international Mirallas, 30, has made more than 150 appearances in royal blue, scoring 29 times.
He spent the second half of last season on loan at his former club, but failed to impress.
Now, though, he looks set to ply his trade in Serie A next season.