Hull City have brought in midfielder Alfred N'Diaye on loan from Villarreal until the end of the season.
The midfielder has previously played in the Premier League for Sunderland.
Serbian international Branislav Ivanovic has ended his eight-year association with Chelsea by completing a move to Zenit St Petersburg.
Mamadou Sakho has departed Liverpool in order to complete a move to Crystal Palace on loan for the rest of the season.
Southampton have signed striker Manolo Gabbiadini from Napoli in a deal worth a reported £17million.