Cameroon's Victor Aboubakar pulled a goal back in the 78th minute.
Chile salvaged a 1-1 draw against a tenacious Australian side on Sunday to ensure progress to the last four of the Confederations Cup. We're searching, we're searching, we're searching and we keep on searching but you have to be able to find one.
Troisi dinked the ball over goalkeeper Claudio Bravo to give Australia the lead after Chile lost possession in midfield.
Werner scored his first goals for the senior national team and made history in the process by becoming the first player for Germany to score twice in a Confederations Cup match.
With Japan looming on 31 August in Australia's penultimate Asian Group B qualifier - Australia is a point adrift of Japan but behind Saudi Arabia only on goal difference - Postecoglou has plenty to ponder.
Cameroon are yet to win a game at the eight-team tournament in Russian Federation.
Salve de tweets de Trump qui exige "des excuses" — Affaire russe
Or, la Russie ne sera pointée du doigt par l'ancien président américain que bien plus tard, en octobre. Un procureur indépendant, Robert Mueller, a été nommé le 17 mai pour enquêter sur "l'affaire russe".
But Werner, who plays for Leipzig in the Bundesliga, restored Germany's two-goal cushion.
Arsenal forward Alexis Sanchez was on target in that game to become Chile's all-time leading scorer with 38 global goals.
Cameroon coach Hugo Broos fielded the same starting line-up for both their opening 2-0 defeat to Chile and Thursday's disappointing 1-1 draw with Australia.
"If he plays tomorrow, he has earned it", said Postecoglou.
Former Everton midfielder Tim Cahill will reach a century of caps for Australia if he features in the game.
An official of the Cameroon team also informed me about the logistic issues they faced with bus delays for their training due to traffic in Moscow.
Cameroon is left to play for classification before returning to Yaounde to begin their preparation for the trip to Uyo to play the Super Eagles in the double headed Russian Federation 2018 World Cup qualifier in August.
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