Loan signings are forbidden but unattached players can still move on free transfers, meaning the likes of Preston, Wigan and Bristol City could strengthen.
The Villans will be without the Belgian for the rest of the campaign.
Leeds should strengthen their squad with these three signings.
Joey O'Brien was released by West Ham United this week after five years at the club and Hammers fans have been having their say on his departure.
Sunderland have been linked with Joey O’Brien in the past.
Sunderland have been linked with West Ham United’s Joey O’Brien.
Sunderland reportedly want to sign West Ham defender Joey O'Brien.
The Irishman has admitted he could leave West Ham on loan.
The Republic of Ireland international is worried about his place in the Euro 2016 finals.
Darren Randolph proved his talent at West Ham earlier this season.