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He said: "I knew two or three weeks ago that there was interest from Sheffield United. I signed a year's loan at Norwich but I had to terminate it.
"Fiorentina took me back for a few hours before I could agree the contract here. There was a little delay but we got it sorted in the end. The aim in the next four months is to do well here and it is massive for me because I come from a big club.
"I have three and half years left with Fiorentina so I have aspirations to play either in the Premier League or Serie A.
"I got promoted with Derby County from this division so I know what it is about. This is a great opportunity for me and hopefully I can help this club achieve what they want - which is promotion.
"I'm a striker who can play on the left-wing. My qualities are speed and I try to read the game, playing off the shoulder of the defender. There is a lot of focus on the Championship in Italy and Sheffield United is a club that is well-known."
Despite being present at Southampton, Lupoli didn't feature in the 2:1 victory but he will be available for selection for Saturday's high noon Steel City Derby with Sheffield Wednesday.