SL Benfica have announced the purchase of CA Boca Juniors midfielder Nicolás Gaitán pending a medical. The Argentinian 22-year-old will move to Lisbon for a fee of €8.4m and will sign a five-year contract with the Portuguese Liga leaders. Benfica need just a point against Rio Ave FC in Sunday's final round of fixtures to be assured of the title. They could have wrapped up the championship this weekend but fell to a 3-1 defeat at FC Porto.