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The Blades had planned to watch the City Slickers defender in a mid-week reserve match but was forced to change their plans when the game was postponed.
Warnock told the Sheffield Star: "We are looking at centre-back cover in case (Robert) Page or (Shaun) Murphy have problems but it would only be on a loan basis.
"Paul is one of a number of players that we are currently monitoring and it was a little disappointing that we couldn't watch him this week."