I don't know exactly how much has been changed to Roma, but here are the most needed ones I can think of.
New manager: Rudi Garcia
Kevin Strootman in
Mehdi Benatia in
Mattia Destro in (permenant transfer to Roma)
Maicon in
Morgan De Sanctis in
Gervinho in
Tin Jedvaj in
Lukasz Skorupski in...