The Colombia international has emerged as a top transfer target for the Portuguese team, although it would take an impressive bid to convince the Argentines to sell the striker
The Lisbon club would be ready to offer up to €7.5 million for the 25-year-old playmaker, a sum which could be sufficient to convince Racing to let go of one of their biggest stars, according to Record
Porto had previously shown strong interest in the playmaker, while Racing have also rejected bids in the past from unnamed Russian and Brazilian outfits.
Gio arrived in Argentina from Atletico Nacional in 2010 and quickly became one of the revelations of the Apertura season at No. 10. He was ruled out for seven months in February 2011 with a cruciate ligament injury that kept him out of the Copa America, but is now fully fit and is part of the Colombia squad that will take on Bolivia on Tuesday.
Sporting, meanwhile, have not lifted the Portuguese title since 2001-02, while seeing bitter rivals Porto and Benfica assert themselves as the dominant forces in the league. If Gio opted for a move to Portugal, he would join 19-year-old compatriot Santiago Arias in the Sporting squad.