Lee Evans has left Bramall Lane to join fellow Sky Bet Championship outfit Wigan Athletic.
United have agreed a loan until January with a permanent transfer to follow for the Wales international, who was on loan at the DW Stadium, prior to arriving at S2 from Wolves in January.
Boss Chris Wilder commented: "When the offer came in Lee expressed an enthusiasm to leave so we decided to sanction the transfer."
The 24-year-old has featured 21 times for the Blades and has started both games this season.
He scored two goals in his time a Blade, with those coming in the 2-1 victory over Middlesbrough at the Lane in April.