Roberto Gagliardini is set to make one final appearance for Atalanta this weekend as his move to Inter Milan is put on hold for a few more days.
Frank De Boer says he has had offers since being sacked by Inter but did not accept any because he felt he had let too many people down at the club.
Sanson, 22, has emerged as one of the most exciting talents in the French top flight.
Milan are due to change hands on March 3, with Chinese investors acquiring the majority stake owned for the last 30 years by Fininvest.
Mauro Icardi says he is confident about the club's future under their new owners Suning Group now that Stefano Pioli has been installed as coach.
Inter Milan midfielder Ever Banega could be about to leave the Serie A club after just six months by moving to China this winter.