West Ham have completed the signing of Barcelona midfielder Alex Song on a season-long loan deal.
West Brom have completed the signing of Argentina winger Sebastian Blanco from Metalist Kharkiv for an undisclosed fee.
Greek teenage winger Charis Mavrias has arrived in Sunderland for a medical ahead of a £2.5million move from Panathinaikos.
The 19-year-old Greece international, who has two caps to his name, has begun talks at the Stadium of Light.
Mavrias is the second youngest player to play in the Champions League - at the age of 16 years and eight months - and has since made more than 60 appearances for Panathinaikos, scoring six goals.