United have signed midfielder Isaiah Osbourne on a three-month deal.
His contract will expire after January 16 and he goes straight into the squad for Saturday's home game with Colchester United.The 26-year-old is a free agent after turning down a new deal to stay at Blackpool earlier this summer.
He joined the Seasiders from Hibernian in 2012, establishing himself as a key player there after making the move to Bloomfield Road.
Osbourne began his career at Aston Villa, making 19 league appearances.
He also enjoyed loan spells at Nottingham Forest, Middlesbrough and Sheffield Wednesday while at Villa Park.
He will take squad number 35.