Cagliari are in negotiations to bring Miguel Layun back to Serie A from FC Porto, on loan with €7m option to buy.
The 29-year-old can play at right-back or left-back and already has some experience of Italian football with Atalanta in 2010.
He moved on to America, Granada, Watford and then Porto for €6m.
According to Italian reports, Cagliari have proposed a loan with option to buy for €7m, but are awaiting the all-clear from Porto.
This season, Mexico international Layun has played only 10 games for the Portuguese club, scoring one goal.