The OFF contract Lille striker is on Friday, July 4 in Turin for its medical and to sign forms.
Speaking with La Stampa, said former Inter Milan and Juventus star Serena: “A great signature, on a free transfer. To compete with the best international clubs, you have to get there for the others.
“David is a complete striker because he attacks the depth very well, he is fast and sees the goal. He can play as a first and second striker, he knows how to play a lot with the team.
“At the age of 25 he already has a lot of experience behind him, he is now entering his last maturation.”
Serena continued: “In that age group, as (Giampiero) Boniperti said, a football player gives the best of himself, both in terms of athletic power and experience.”