The 31 year old had his best peak of his career when he played for the Blades from 2000-2004. He made it to two cup semi-finals and a play-off final (where he missed a penalty).
He made 150 appearances and bagged 28 goals. He has currently made 31 appearances for Wigan Athletic but scoring no goals. His last competitive goal was at Tottenham Hotspur in the 2005/06 season.
The Blades do look like to raid the JJB with winger David Cotterill on Blackwell's wanted list. Cotterill impressed Blackwell when he made 15 appearances mixed with some impressive performances.
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