Italian media reports that the fee for the centre-back is believed to be around £4.5million.
“With all the paperwork now given into the offices of the Lega Nazionale Professionisti this afternoon, the purchase of the Brazilian international captain Lucio is now completed,” a club statement read.
“We extend our welcome to Lucio, who has signed with the club until June 30, 2012, from everyone at Inter and all our supporters,” the statement concluded.