The Premier League do not allow players to play against the club they are on loan from but under the Football League rules players can play against their club.
Their was thoughts that Lucketti could be re-called after Chris Morgan and Ugo Ehiogu will both sit out. He could be re-called by Blackwell if wanted but otherwise on-loan Reading defender John Halls will slip into the central defensive position.
The Blades go into the match two points off a play-off place and still can reach the gateway, but do have to rely on other results going their way. Meanwhile Southampton can get relegated to League 1 if they don't collect the three points.