"We faced the European champions, a team that plays at a very high level, and we played equal to them".
With Mexico still scrambling at the back, another delivery from the right was flicked into the bottom-left corner by Nani, but the referee - assisted by the VAR - disallowed the goal for offside.
In all, being used for the first time, the VAR process was relatively quick, seamless, and accurate.
Portugal took the lead following an excellent run from Cristiano Ronaldo before he slipped an excellent pass to Ricardo Quaresma who faked out Guillermo Ochoa before slotting the ball into an open net.
In the second half, Cedric Soares scored the second goal for Portugal just four minutes before the end of the game.
In group A are also teams of Russia and New Zealand played their match on Saturday, the meeting ended with the victory of Russians with the score 2:0.
Portugal didn't look entirely comfortable defending the unorthodox position and Hernandez could have scored three in the last seven minutes of the first half.
Man U should go all-in on Cristiano Ronaldo if he becomes available
That bumper pay rise helped Ronaldo, 32, become the best-paid sportsmen in the world. Ronaldo has denied any wrongdoing.
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.
Nani was already celebrating with his teammates when Argentine referee Nestor Pitana asked for the ball and indicated the goal was being reviewed.
"It is a little hard for the players", Chile coach Juan Antonio Pizzi said.
Portugal coach Fernando Santos said it was not the performance he expected from his team.
Ronaldo is at the centre of a transfer saga after the player told Real Madrid he wants to quit the club. But a late header from Moreno secured the 2-2 draw in injury time, giving a precious point to Mexico.
Carlos Vela crossed for Hernandez to finish from close range after an error from Raphael Guerreiro and the goal gave Mexico the jolt of confidence it badly needed, with the game on the verge of slipping away and Ronaldo looking in a menacing mood.
Portugal and Mexico both made changes as the hour-mark approached in a bid to find that killer second goal, with Dos Santos and Andre Silva coming on and as the clock ticked, the game began to get stretched.
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