The 28-year-old had never been called up prior to Germany's World Cup qualification game against Denmark on June 6.
Chile salvaged a 1-1 draw against a tenacious Australian side on Sunday to ensure progress to the last four of the Confederations Cup. The German team have advanced to the semifinals of every global tournament since the 2006 World Cup.
"They're a fantastic team and we've played one of the best teams in the world off the park", he added.
Chile opted for another change on 82 minutes as Vargas made way for Marcelo Diaz as they pushed for a winning goal.
With first-choice shot-stopper Manuel Neuer recovering from foot surgery, Loew says he may well rotate his goalkeeper with Paris Saint-Germain's Kevin Trapp expected to start.
Australia can only guarantee passage with a two-goal win over the South American champions, a result they've never managed over such a high quality opponent in a competitive match.
"Tomorrow will be one of the most challenging and physically intensive games".
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"We'll try and take the game to them right from he beginning".
Former Everton midfielder Tim Cahill will reach a century of caps for Australia if he features in the game.
Chile goalkeeper Claudio Bravo, playing for the first time in two months due to a calf injury, showed no signs of rust, showing quick reactions to block Massimo Luongo's 36th-minute effort at the near post. "He's a great player who doesn't just score goals - he helps the team too".
Postecoglou was delighted with his side's display at Spartak Stadium but described their failure to advance as a "missed opportunity".
Chile's captain, Inter Milan defender Gary Medel, is fit despite limping out of the draw against Germany with cramp.
But their hopes of a comeback were effectively extinguished when Mabouka was eventually dismissed for a risky challenge on Can, referee Wilmar Roldan first booking Siani and then producing a red card for the midfielder before reviewing the footage a second time on the protests of Cameroon players.
Chile are strong favorites and Pizzi is likely to stick with most of the starting 11 that began against Germany - including midfield general Arturo Vidal and top scorer Alexis Sanchez.