Ravel Morrison has returned to parent club West Ham from Cardiff City on compassionate leave.
Brighton boss Sami Hyypia is weighing up a move for former France captain Alou Diarra.
Niklas Moisander has returned to Ajax after completing his move from Eredivisie rivals AZ Alkmaar for a fee believed to be in the region of 3million euros.
Moisander spent two years at the Amsterdam Arena between 2004 and 2006 but failed to make a first-team appearance before moving on to Belgian outfit FC Zwolle and then AZ.
But Ajax announced on Tuesday they have re-signed the Finland international defender, who has put pen to paper on a three-year deal.
Moisander admitted he always harboured ambitions of returning to the club and hopes to make his debut in the home clash with NAC Breda at the weekend.
"It was a hectic summer, but I'm glad it's all come good. Ajax is my dream club," the 26-year-old told the club's official website.
"I am very fit and want to make my debut. Hopefully that happens Saturday night in the home match against NAC Breda."
The defending champions have moved to bring the centre-half back to the club as the replacement for former captain Jan Vertonghen, who joined Tottenham earlier this summer.
"I am not going to walk in his shoes, but I will just fill in, in my own way. I have every confidence that I will succeed," added Moisander.
Ajax boss Frank de Boer was thrilled with his latest acquisition and has predicted he will make more of an impact this time around.
"Niklas is a real Ajax player. He has clearly developed in recent years. Therefore he is now qualified for a return to Ajax," said De Boer.
"He is also a leader. For Ajax, Niklas is almost a 'veteran'. But that's exactly what Ajax needs now. He knows the tricks of the top football."