The former Doncaster Rovers forward was reportedly offered to Massimo Cellino earlier this summer but the United owner decided against making a move.
Reports suggested that Cellino didn't want to move for Sharp due to him being 28-years-old but it now appears as if he has had a change of heart with Dave Hockaday eager to work with him.
Leeds' performance against Millwall last Saturday sent alarm bells ringing and with Giuseppe Belluschi also signed, it appears as if United are starting to build a competitive squad for the 2014/15 season.
Sharp's deal is a brilliant bit of business from Leeds for a number of reasons. He is proven at this level and wouldn't have required a big fee as his Saints deal expired at the end of the current campaign.
His record speaks for itself and he will hopefully help fill the void left by Ross McCormack. With Sharp now in, United have something healthy competition for places up top.
Chesterfield's Liam Cooper is also set to sign in the next few days but United still need quality proven wingers before the end of the transfer window.
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