Broos' side overcame a hard start, in which they looked like they would be swamped by Chile's all-action approach, and gradually grew into the game only to be undone by late goals from Arturo Vidal and Eduardo Vargas.
Portugal's Cristiano Ronaldo and Mexico's Carlos Vela jump for the ball during the Confederations Cup, Group A soccer match between Portugal and Mexico, at the Kazan Arena, Russia, Sunday, June 18, 2017.
Juan Antonio Pizzi had opted to bench Sanchez for Sunday's encounter as the Arsenal man continues his recovery from an ankle injury, but the attacker played a key role in his side's win in the end as he had a hand in both goals.
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Players milled about in confusion, some briefly appearing to think the referee had blown for half-time, and Chile's many traveling fans struggled to understand what was going on.
The review found Vargas offside by a matter of inches, enraging him and Vidal.
The 28-year-old was subbed on in the 58th minute before Arturo Vidal and Eduardo Vargas scored late on to secure the victory.
Vargas finally secured his goal in the 90th minute when he fired home after Sanchez rounded the keeper and saw his shot saved by a defender.
It was all about the South Americans in the entire first half, but they missed a couple of chances.
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Vargas was next to have a chance for the Chileans when Vidal played the striker through on goal but he put his shot well over the bar when he should have done so much better.
In the 23rd minute, Cameroon had the ball in the net.
"He has been tested and it seems he will recover - we are quite optimistic - but we realise that he needs to recover and he is still feeling some pain".
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Host Russia were clearly the better side as they missed a handful of chances, but the three points was all that matters. When asked whether the Russian team has a chance of winning the trophy, Mutko replied "Yes, judging by their devotion".