Wright has only played a handful of games for the Blades this season

The 35-year-old is caretaker manager John Carver's first signing and joins the squad for training on Thursday.

Carver told the club website: "Alan comes with a wealth of experience as he has made only 500 appearances mostly in the Premier League.

"He's got good energy and he will attack and go forward but primarily he is a defender."

Wright, whose last appearance for Sheffield United was against Arsenal on 23 September, has played for a host of clubs including Blackpool, Blackburn and Middlesbrough as well as eight years at Aston Villa.