The defender who is not transfer listed is believed to be a target for the City Ground club who lost their Championship status on the last day of last season.Chris Morgan: Will he be a Blade next season?
Meanwhile, despite the capture of Craig Short from Blackburn it is believed that Neil Warnock is planning a £300,000 bid for former Chesterfield defender Ian Brekin who applies his trade at Wigan Athletic.
We don't however think this rumour is true, Danny Cullip, Phil Jagielka, Leigh Bromby and Simon Francis are other players who can take over the centre-back role but United are short at the back and need more defenders.