Marko Marin and Fernando Torres has joined from Chelsea on loan.
Juventus have signed striker Alvaro Morata from Real Madrid and left-back Patrice Evra from Manchester United.
Luca Morrone has joined from Sassuolo.
Stefan de Vrij has joined from Feyenoord for an undisclosed fee.
Alber Riera has joined from Turkish side Galatasaray.
Midfielder Lucas Evangelista has signed from Sao Paulo.