There has been speculation that Lucketti would play against the Blades in the final game of the season at the weekend. Although he has taken the decision not to play for the Saints against the Blades.
Lucketti has been on-loan at Southampton for the past four games but he has now returned from his loan spell from St.Mary's back to Bramall Lane.
The thirty six year old may be able to play for United if wanted to by Blackwell as Chris Morgan and Ugo Ehiogu will both sit out the game.