League Two Crewe Alexandra have signed Middlesbrough youngster Callum Cooke on loan for the rest of the season.
The teenage midfielder will be joined at Gresty Road by striker Jonny Margetts, who has moved from Scunthorpe.
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.