Italian goalkeeper Gianluigi Buffon said Tuesday he will retire at the end of the season unless Juventus win the Champions League. The 39-year-old plans to bring the curtain down on his career after the 2018 World Cup, but if Juventus triumph in Europe he could continue on to try to add the Club World Cup to his collection. "There's no margin [to change mind] because I'm quite convinced of the choices I've made," Buffon, who was named as the goalkeeper of the year at FIFA's The Best awards on Monday, told Sky Sport. "This is my last season and I'm pretty sure of the choices I make. One or two more years wouldn't add or take away from what I've already achieved.The only way would be to win the Champions League," he continued.